firefox: Use-after-free in the DOM: Core & HTML component

cve CVE-2026-100791 3 sources, 3 claims · Watch

Red Hat writes:
firefox: Use-after-free in the DOM: Core & HTML component the claim

Severity: high GitHub advisories
HIGH NVD
important Red Hat
CVSS they disagree: 8.8 GitHub advisories
8.8 NVD
7.5 Red Hat
Vendor: Mozilla NVD
Product: Firefox NVD
CWE: CWE-416 GitHub advisories
CWE-416 NVD
CWE-825 Red Hat

How far exploitation has got

No public code known
Proof of concept
Proof of concept, verified
A Metasploit module
Exploited in the wild
Used in ransomware campaigns

Why the CVSS differs

Metric	NVD	Red Hat
Attack vector AV	network N	network N
Attack complexity AC	low L	high H
Privileges required PR	none N	none N
User interaction UI	required R	required R
Scope S	unchanged U	unchanged U
Confidentiality C	high H	high H
Integrity I	high H	high H
Availability A	high H	high H

Each source scores the same vulnerability from what it judges the attack to need. The rows marked are where they judge it differently.

Timeline

2026-09-29	first spoke of it: Use-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox ESR 153...	GitHub advisories
2026-09-29	first spoke of it: Use-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17.	NVD
2026-09-29	first spoke of it: firefox: Use-after-free in the DOM: Core & HTML component	Red Hat

What it is to other things

In words only, so not counted until a person confirms one:

affects	`mozilla/firefox` NVD says “Mozilla · Firefox”
made_by	`mozilla` NVD says “Mozilla”

Every value, with what each source said and its receipt

Property Source Said Means here

Automatable

automatable

NVD

At least one of those steps needs a person.

receipt

Source: NVD
Its words: no
Read by: field:cve.metrics.ssvcV203[].ssvcData.options[].automatable
Said since: 2026-10-06 12:31 UTC
Last answered: 2026-10-06 12:41 UTC
Original: open at the source

2026-10-06 12:31 UTC	no
2026-09-29 17:49 UTC	—

What the source handed over

{
  "cve": {
    "affected": [
      {
        "affectedData": [
          {
            "product": "Firefox",
            "vendor": "Mozilla",
            "versions": [
              {
                "lessThanOrEqual": "115.*",
                "status": "unaffected",
                "version": "115.42",
                "versionType": "rpm"
              },
              {
                "lessThanOrEqual": "140.*",
                "status": "unaffected",
                "version": "140.17",
                "versionType": "rpm"
              },
              {
                "lessThanOrEqual": "153.*",
                "status": "unaffected",
                "version": "153.4",
                "versionType": "rpm"
              },
              {
                "lessThanOrEqual": "*",
                "status": "unaffected",
                "version": "157",
                "versionType": "rpm"
              }
            ]
          },
          {
            "product": "Thunderbird",
            "vendor": "Mozilla",
            "versions": [
              {
                "lessThanOrEqual": "140.*",
                "status": "unaffected",
                "version": "140.17",
                "versionType": "rpm"
              },
              {
                "lessThanOrEqual": "153.*",
                "status": "unaffected",
                "version": "153.4",
                "versionType": "rpm"
              },
              {
                "lessThanOrEqual": "*",
                "status": "unaffected",
                "version": "157",
                "versionType": "rpm"
              }
            ]
          }
        ],
        "source": "security@mozilla.org"
      }
    ],
    "cveTags": [],
    "descriptions": [
      {
        "lang": "en",
        "value": "Use-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17."
      }
    ],
    "id": "CVE-2026-100791",
    "lastModified": "2026-09-30T18:18:07.853",
    "metrics": {
      "cvssMetricV31": [
        {
          "cvssData": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "exploitabilityScore": 2.8,
          "impactScore": 5.9,
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "type": "Secondary"
        }
      ],
      "ssvcV203": [
        {
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "ssvcData": {
            "id": "CVE-2026-100791",
            "options": [
              {
                "exploitation": "none"
              },
              {
                "automatable": "no"
              },
              {
                "technicalImpact": "total"
              }
            ],
            "role": "CISA Coordinator",
            "timestamp": "2026-09-29T00:00:00+00:00",
            "version": "2.0.3"
          }
        }
      ]
    },
    "published": "2026-09-29T13:17:44.133",
    "references": [
      {
        "source": "security@mozilla.org",
        "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=2072433"
      },
      {
        "source": "security@mozilla.org",
        "url": "https://www.mozilla.org/security/advisories/mfsa2026-100/"
      },
      {
        "source": "security@mozilla.org",
        "url": "https://www.mozilla.org/security/advisories/mfsa2026-101/"
      },
      {
        "source": "security@mozilla.org",
        "url": "https://www.mozilla.org/security/advisories/mfsa2026-102/"
      },
      {
        "source": "security@mozilla.org",
        "url": "https://www.mozilla.org/security/advisories/mfsa2026-103/"
      },
      {
        "source": "security@mozilla.org",
        "url": "https://www.mozilla.org/security/advisories/mfsa2026-97/"
      },
      {
        "source": "security@mozilla.org",
        "url": "https://www.mozilla.org/security/advisories/mfsa2026-98/"
      },
      {
        "source": "security@mozilla.org",
        "url": "https://www.mozilla.org/security/advisories/mfsa2026-99/"
      }
    ],
    "sourceIdentifier": "security@mozilla.org",
    "vulnStatus": "Undergoing Analysis",
    "weaknesses": [
      {
        "description": [
          {
            "lang": "en",
            "value": "CWE-416"
          }
        ],
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary"
      }
    ]
  }
}

—

CVSS

cvss

conflict

GitHub advisories

8.8

receipt

Source: GitHub advisories
Its words: 8.8
Read by: field:cvss.score
Said since: 2026-10-02 11:59 UTC
Last answered: 2026-10-06 13:46 UTC
Original: open at the source

What the source handed over

{
  "credits": [],
  "cve_id": "CVE-2026-100791",
  "cvss": {
    "score": 8.8,
    "vector_string": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"
  },
  "cvss_severities": {
    "cvss_v3": {
      "score": 8.8,
      "vector_string": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"
    },
    "cvss_v4": {
      "score": 0.0,
      "vector_string": null
    }
  },
  "cwes": [
    {
      "cwe_id": "CWE-416",
      "name": "Use After Free"
    }
  ],
  "description": "Use-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox ESR 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17.",
  "epss": {
    "percentage": 0.0034,
    "percentile": 0.25099
  },
  "ghsa_id": "GHSA-94vx-qc4v-5hhg",
  "github_reviewed_at": null,
  "html_url": "https://github.com/advisories/GHSA-94vx-qc4v-5hhg",
  "identifiers": [
    {
      "type": "GHSA",
      "value": "GHSA-94vx-qc4v-5hhg"
    },
    {
      "type": "CVE",
      "value": "CVE-2026-100791"
    }
  ],
  "nvd_published_at": "2026-09-29T13:17:44Z",
  "published_at": "2026-09-29T15:31:28Z",
  "references": [
    "https://nvd.nist.gov/vuln/detail/CVE-2026-100791",
    "https://bugzilla.mozilla.org/show_bug.cgi?id=2072433",
    "https://www.mozilla.org/security/advisories/mfsa2026-100",
    "https://www.mozilla.org/security/advisories/mfsa2026-97",
    "https://www.mozilla.org/security/advisories/mfsa2026-98",
    "https://www.mozilla.org/security/advisories/mfsa2026-99",
    "https://www.mozilla.org/security/advisories/mfsa2026-101",
    "https://www.mozilla.org/security/advisories/mfsa2026-102",
    "https://www.mozilla.org/security/advisories/mfsa2026-103",
    "https://github.com/advisories/GHSA-94vx-qc4v-5hhg"
  ],
  "repository_advisory_url": null,
  "severity": "high",
  "source_code_location": "",
  "summary": "Use-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox ESR 153...",
  "type": "unreviewed",
  "updated_at": "2026-09-30T18:34:15Z",
  "url": "https://api.github.com/advisories/GHSA-94vx-qc4v-5hhg",
  "vulnerabilities": [],
  "withdrawn_at": null
}

—

CVSS

cvss

conflict

NVD

8.8

receipt

Source: NVD
Its words: 8.8
Read by: field:cve.metrics.cvssMetricV31[type=Primary].cvssData.baseScore || field:cve.metrics.cvssMetricV31[].cvssData.baseScore
Said since: 2026-09-29 17:49 UTC
Last answered: 2026-10-06 12:41 UTC
Original: open at the source

What the source handed over

{
  "cve": {
    "affected": [
      {
        "affectedData": [
          {
            "product": "Firefox",
            "vendor": "Mozilla",
            "versions": [
              {
                "lessThanOrEqual": "115.*",
                "status": "unaffected",
                "version": "115.42",
                "versionType": "rpm"
              },
              {
                "lessThanOrEqual": "140.*",
                "status": "unaffected",
                "version": "140.17",
                "versionType": "rpm"
              },
              {
                "lessThanOrEqual": "153.*",
                "status": "unaffected",
                "version": "153.4",
                "versionType": "rpm"
              },
              {
                "lessThanOrEqual": "*",
                "status": "unaffected",
                "version": "157",
                "versionType": "rpm"
              }
            ]
          },
          {
            "product": "Thunderbird",
            "vendor": "Mozilla",
            "versions": [
              {
                "lessThanOrEqual": "140.*",
                "status": "unaffected",
                "version": "140.17",
                "versionType": "rpm"
              },
              {
                "lessThanOrEqual": "153.*",
                "status": "unaffected",
                "version": "153.4",
                "versionType": "rpm"
              },
              {
                "lessThanOrEqual": "*",
                "status": "unaffected",
                "version": "157",
                "versionType": "rpm"
              }
            ]
          }
        ],
        "source": "security@mozilla.org"
      }
    ],
    "cveTags": [],
    "descriptions": [
      {
        "lang": "en",
        "value": "Use-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17."
      }
    ],
    "id": "CVE-2026-100791",
    "lastModified": "2026-09-30T18:18:07.853",
    "metrics": {
      "cvssMetricV31": [
        {
          "cvssData": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "exploitabilityScore": 2.8,
          "impactScore": 5.9,
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "type": "Secondary"
        }
      ],
      "ssvcV203": [
        {
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "ssvcData": {
            "id": "CVE-2026-100791",
            "options": [
              {
                "exploitation": "none"
              },
              {
                "automatable": "no"
              },
              {
                "technicalImpact": "total"
              }
            ],
            "role": "CISA Coordinator",
            "timestamp": "2026-09-29T00:00:00+00:00",
            "version": "2.0.3"
          }
        }
      ]
    },
    "published": "2026-09-29T13:17:44.133",
    "references": [
      {
        "source": "security@mozilla.org",
        "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=2072433"
      },
      {
        "source": "security@mozilla.org",
        "url": "https://www.mozilla.org/security/advisories/mfsa2026-100/"
      },
      {
        "source": "security@mozilla.org",
        "url": "https://www.mozilla.org/security/advisories/mfsa2026-101/"
      },
      {
        "source": "security@mozilla.org",
        "url": "https://www.mozilla.org/security/advisories/mfsa2026-102/"
      },
      {
        "source": "security@mozilla.org",
        "url": "https://www.mozilla.org/security/advisories/mfsa2026-103/"
      },
      {
        "source": "security@mozilla.org",
        "url": "https://www.mozilla.org/security/advisories/mfsa2026-97/"
      },
      {
        "source": "security@mozilla.org",
        "url": "https://www.mozilla.org/security/advisories/mfsa2026-98/"
      },
      {
        "source": "security@mozilla.org",
        "url": "https://www.mozilla.org/security/advisories/mfsa2026-99/"
      }
    ],
    "sourceIdentifier": "security@mozilla.org",
    "vulnStatus": "Undergoing Analysis",
    "weaknesses": [
      {
        "description": [
          {
            "lang": "en",
            "value": "CWE-416"
          }
        ],
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary"
      }
    ]
  }
}

—

CVSS

cvss

conflict

Red Hat

7.5

receipt

Source: Red Hat
Its words: 7.5
Read by: field:cvss3_score
Said since: 2026-10-06 13:01 UTC
Last answered: 2026-10-06 13:02 UTC
Original: open at the source

What the source handed over

{
  "CVE": "CVE-2026-100791",
  "CWE": "CWE-825",
  "advisories": [],
  "affected_packages": [],
  "bugzilla": "2543149",
  "bugzilla_description": "firefox: Use-after-free in the DOM: Core & HTML component",
  "cvss3_score": "7.5",
  "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H",
  "cvss_score": null,
  "cvss_scoring_vector": null,
  "package_state": null,
  "public_date": "2026-09-29T12:36:12Z",
  "resource_url": "https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-100791.json",
  "severity": "important"
}

—

CVSS vector

cvss_vector

not compared

NVD

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

receipt

Source: NVD
Its words: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Read by: field:cve.metrics.cvssMetricV31[type=Primary].cvssData.vectorString || field:cve.metrics.cvssMetricV31[].cvssData.vectorString
Said since: 2026-10-06 12:31 UTC
Last answered: 2026-10-06 12:41 UTC
Original: open at the source

2026-10-06 12:31 UTC	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
2026-09-29 17:49 UTC	—

What the source handed over

{
  "cve": {
    "affected": [
      {
        "affectedData": [
          {
            "product": "Firefox",
            "vendor": "Mozilla",
            "versions": [
              {
                "lessThanOrEqual": "115.*",
                "status": "unaffected",
                "version": "115.42",
                "versionType": "rpm"
              },
              {
                "lessThanOrEqual": "140.*",
                "status": "unaffected",
                "version": "140.17",
                "versionType": "rpm"
              },
              {
                "lessThanOrEqual": "153.*",
                "status": "unaffected",
                "version": "153.4",
                "versionType": "rpm"
              },
              {
                "lessThanOrEqual": "*",
                "status": "unaffected",
                "version": "157",
                "versionType": "rpm"
              }
            ]
          },
          {
            "product": "Thunderbird",
            "vendor": "Mozilla",
            "versions": [
              {
                "lessThanOrEqual": "140.*",
                "status": "unaffected",
                "version": "140.17",
                "versionType": "rpm"
              },
              {
                "lessThanOrEqual": "153.*",
                "status": "unaffected",
                "version": "153.4",
                "versionType": "rpm"
              },
              {
                "lessThanOrEqual": "*",
                "status": "unaffected",
                "version": "157",
                "versionType": "rpm"
              }
            ]
          }
        ],
        "source": "security@mozilla.org"
      }
    ],
    "cveTags": [],
    "descriptions": [
      {
        "lang": "en",
        "value": "Use-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17."
      }
    ],
    "id": "CVE-2026-100791",
    "lastModified": "2026-09-30T18:18:07.853",
    "metrics": {
      "cvssMetricV31": [
        {
          "cvssData": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "exploitabilityScore": 2.8,
          "impactScore": 5.9,
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "type": "Secondary"
        }
      ],
      "ssvcV203": [
        {
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "ssvcData": {
            "id": "CVE-2026-100791",
            "options": [
              {
                "exploitation": "none"
              },
              {
                "automatable": "no"
              },
              {
                "technicalImpact": "total"
              }
            ],
            "role": "CISA Coordinator",
            "timestamp": "2026-09-29T00:00:00+00:00",
            "version": "2.0.3"
          }
        }
      ]
    },
    "published": "2026-09-29T13:17:44.133",
    "references": [
      {
        "source": "security@mozilla.org",
        "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=2072433"
      },
      {
        "source": "security@mozilla.org",
        "url": "https://www.mozilla.org/security/advisories/mfsa2026-100/"
      },
      {
        "source": "security@mozilla.org",
        "url": "https://www.mozilla.org/security/advisories/mfsa2026-101/"
      },
      {
        "source": "security@mozilla.org",
        "url": "https://www.mozilla.org/security/advisories/mfsa2026-102/"
      },
      {
        "source": "security@mozilla.org",
        "url": "https://www.mozilla.org/security/advisories/mfsa2026-103/"
      },
      {
        "source": "security@mozilla.org",
        "url": "https://www.mozilla.org/security/advisories/mfsa2026-97/"
      },
      {
        "source": "security@mozilla.org",
        "url": "https://www.mozilla.org/security/advisories/mfsa2026-98/"
      },
      {
        "source": "security@mozilla.org",
        "url": "https://www.mozilla.org/security/advisories/mfsa2026-99/"
      }
    ],
    "sourceIdentifier": "security@mozilla.org",
    "vulnStatus": "Undergoing Analysis",
    "weaknesses": [
      {
        "description": [
          {
            "lang": "en",
            "value": "CWE-416"
          }
        ],
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary"
      }
    ]
  }
}

—

CVSS vector

cvss_vector

not compared

Red Hat

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

receipt

Source: Red Hat
Its words: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Read by: field:cvss3_scoring_vector
Said since: 2026-10-06 13:01 UTC
Last answered: 2026-10-06 13:02 UTC
Original: open at the source

What the source handed over

{
  "CVE": "CVE-2026-100791",
  "CWE": "CWE-825",
  "advisories": [],
  "affected_packages": [],
  "bugzilla": "2543149",
  "bugzilla_description": "firefox: Use-after-free in the DOM: Core & HTML component",
  "cvss3_score": "7.5",
  "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H",
  "cvss_score": null,
  "cvss_scoring_vector": null,
  "package_state": null,
  "public_date": "2026-09-29T12:36:12Z",
  "resource_url": "https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-100791.json",
  "severity": "important"
}

—

CWE

cwe

different words

GitHub advisories

CWE-416

receipt

Source: GitHub advisories
Its words: CWE-416
Read by: field:cwes[].cwe_id
Said since: 2026-10-02 11:59 UTC
Last answered: 2026-10-06 13:46 UTC
Original: open at the source

What the source handed over

{
  "credits": [],
  "cve_id": "CVE-2026-100791",
  "cvss": {
    "score": 8.8,
    "vector_string": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"
  },
  "cvss_severities": {
    "cvss_v3": {
      "score": 8.8,
      "vector_string": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"
    },
    "cvss_v4": {
      "score": 0.0,
      "vector_string": null
    }
  },
  "cwes": [
    {
      "cwe_id": "CWE-416",
      "name": "Use After Free"
    }
  ],
  "description": "Use-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox ESR 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17.",
  "epss": {
    "percentage": 0.0034,
    "percentile": 0.25099
  },
  "ghsa_id": "GHSA-94vx-qc4v-5hhg",
  "github_reviewed_at": null,
  "html_url": "https://github.com/advisories/GHSA-94vx-qc4v-5hhg",
  "identifiers": [
    {
      "type": "GHSA",
      "value": "GHSA-94vx-qc4v-5hhg"
    },
    {
      "type": "CVE",
      "value": "CVE-2026-100791"
    }
  ],
  "nvd_published_at": "2026-09-29T13:17:44Z",
  "published_at": "2026-09-29T15:31:28Z",
  "references": [
    "https://nvd.nist.gov/vuln/detail/CVE-2026-100791",
    "https://bugzilla.mozilla.org/show_bug.cgi?id=2072433",
    "https://www.mozilla.org/security/advisories/mfsa2026-100",
    "https://www.mozilla.org/security/advisories/mfsa2026-97",
    "https://www.mozilla.org/security/advisories/mfsa2026-98",
    "https://www.mozilla.org/security/advisories/mfsa2026-99",
    "https://www.mozilla.org/security/advisories/mfsa2026-101",
    "https://www.mozilla.org/security/advisories/mfsa2026-102",
    "https://www.mozilla.org/security/advisories/mfsa2026-103",
    "https://github.com/advisories/GHSA-94vx-qc4v-5hhg"
  ],
  "repository_advisory_url": null,
  "severity": "high",
  "source_code_location": "",
  "summary": "Use-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox ESR 153...",
  "type": "unreviewed",
  "updated_at": "2026-09-30T18:34:15Z",
  "url": "https://api.github.com/advisories/GHSA-94vx-qc4v-5hhg",
  "vulnerabilities": [],
  "withdrawn_at": null
}

—

CWE

cwe

different words

NVD

CWE-416

receipt

Source: NVD
Its words: CWE-416
Read by: field:cve.weaknesses[].description[].value
Said since: 2026-10-06 12:31 UTC
Last answered: 2026-10-06 12:41 UTC
Original: open at the source

2026-10-06 12:31 UTC	CWE-416
2026-09-29 17:49 UTC	—

What the source handed over

{
  "cve": {
    "affected": [
      {
        "affectedData": [
          {
            "product": "Firefox",
            "vendor": "Mozilla",
            "versions": [
              {
                "lessThanOrEqual": "115.*",
                "status": "unaffected",
                "version": "115.42",
                "versionType": "rpm"
              },
              {
                "lessThanOrEqual": "140.*",
                "status": "unaffected",
                "version": "140.17",
                "versionType": "rpm"
              },
              {
                "lessThanOrEqual": "153.*",
                "status": "unaffected",
                "version": "153.4",
                "versionType": "rpm"
              },
              {
                "lessThanOrEqual": "*",
                "status": "unaffected",
                "version": "157",
                "versionType": "rpm"
              }
            ]
          },
          {
            "product": "Thunderbird",
            "vendor": "Mozilla",
            "versions": [
              {
                "lessThanOrEqual": "140.*",
                "status": "unaffected",
                "version": "140.17",
                "versionType": "rpm"
              },
              {
                "lessThanOrEqual": "153.*",
                "status": "unaffected",
                "version": "153.4",
                "versionType": "rpm"
              },
              {
                "lessThanOrEqual": "*",
                "status": "unaffected",
                "version": "157",
                "versionType": "rpm"
              }
            ]
          }
        ],
        "source": "security@mozilla.org"
      }
    ],
    "cveTags": [],
    "descriptions": [
      {
        "lang": "en",
        "value": "Use-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17."
      }
    ],
    "id": "CVE-2026-100791",
    "lastModified": "2026-09-30T18:18:07.853",
    "metrics": {
      "cvssMetricV31": [
        {
          "cvssData": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "exploitabilityScore": 2.8,
          "impactScore": 5.9,
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "type": "Secondary"
        }
      ],
      "ssvcV203": [
        {
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "ssvcData": {
            "id": "CVE-2026-100791",
            "options": [
              {
                "exploitation": "none"
              },
              {
                "automatable": "no"
              },
              {
                "technicalImpact": "total"
              }
            ],
            "role": "CISA Coordinator",
            "timestamp": "2026-09-29T00:00:00+00:00",
            "version": "2.0.3"
          }
        }
      ]
    },
    "published": "2026-09-29T13:17:44.133",
    "references": [
      {
        "source": "security@mozilla.org",
        "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=2072433"
      },
      {
        "source": "security@mozilla.org",
        "url": "https://www.mozilla.org/security/advisories/mfsa2026-100/"
      },
      {
        "source": "security@mozilla.org",
        "url": "https://www.mozilla.org/security/advisories/mfsa2026-101/"
      },
      {
        "source": "security@mozilla.org",
        "url": "https://www.mozilla.org/security/advisories/mfsa2026-102/"
      },
      {
        "source": "security@mozilla.org",
        "url": "https://www.mozilla.org/security/advisories/mfsa2026-103/"
      },
      {
        "source": "security@mozilla.org",
        "url": "https://www.mozilla.org/security/advisories/mfsa2026-97/"
      },
      {
        "source": "security@mozilla.org",
        "url": "https://www.mozilla.org/security/advisories/mfsa2026-98/"
      },
      {
        "source": "security@mozilla.org",
        "url": "https://www.mozilla.org/security/advisories/mfsa2026-99/"
      }
    ],
    "sourceIdentifier": "security@mozilla.org",
    "vulnStatus": "Undergoing Analysis",
    "weaknesses": [
      {
        "description": [
          {
            "lang": "en",
            "value": "CWE-416"
          }
        ],
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary"
      }
    ]
  }
}

—

CWE

cwe

different words

Red Hat

CWE-825

receipt

Source: Red Hat
Its words: CWE-825
Read by: field:CWE
Said since: 2026-10-06 13:01 UTC
Last answered: 2026-10-06 13:02 UTC
Original: open at the source

What the source handed over

{
  "CVE": "CVE-2026-100791",
  "CWE": "CWE-825",
  "advisories": [],
  "affected_packages": [],
  "bugzilla": "2543149",
  "bugzilla_description": "firefox: Use-after-free in the DOM: Core & HTML component",
  "cvss3_score": "7.5",
  "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H",
  "cvss_score": null,
  "cvss_scoring_vector": null,
  "package_state": null,
  "public_date": "2026-09-29T12:36:12Z",
  "resource_url": "https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-100791.json",
  "severity": "important"
}

—

Exploitation

exploitation

NVD

none

No evidence of exploitation, and no public proof of concept.

receipt

Source: NVD
Its words: none
Read by: field:cve.metrics.ssvcV203[].ssvcData.options[].exploitation
Said since: 2026-10-06 12:31 UTC
Last answered: 2026-10-06 12:41 UTC
Original: open at the source

2026-10-06 12:31 UTC	none
2026-09-29 17:49 UTC	—

What the source handed over

{
  "cve": {
    "affected": [
      {
        "affectedData": [
          {
            "product": "Firefox",
            "vendor": "Mozilla",
            "versions": [
              {
                "lessThanOrEqual": "115.*",
                "status": "unaffected",
                "version": "115.42",
                "versionType": "rpm"
              },
              {
                "lessThanOrEqual": "140.*",
                "status": "unaffected",
                "version": "140.17",
                "versionType": "rpm"
              },
              {
                "lessThanOrEqual": "153.*",
                "status": "unaffected",
                "version": "153.4",
                "versionType": "rpm"
              },
              {
                "lessThanOrEqual": "*",
                "status": "unaffected",
                "version": "157",
                "versionType": "rpm"
              }
            ]
          },
          {
            "product": "Thunderbird",
            "vendor": "Mozilla",
            "versions": [
              {
                "lessThanOrEqual": "140.*",
                "status": "unaffected",
                "version": "140.17",
                "versionType": "rpm"
              },
              {
                "lessThanOrEqual": "153.*",
                "status": "unaffected",
                "version": "153.4",
                "versionType": "rpm"
              },
              {
                "lessThanOrEqual": "*",
                "status": "unaffected",
                "version": "157",
                "versionType": "rpm"
              }
            ]
          }
        ],
        "source": "security@mozilla.org"
      }
    ],
    "cveTags": [],
    "descriptions": [
      {
        "lang": "en",
        "value": "Use-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17."
      }
    ],
    "id": "CVE-2026-100791",
    "lastModified": "2026-09-30T18:18:07.853",
    "metrics": {
      "cvssMetricV31": [
        {
          "cvssData": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "exploitabilityScore": 2.8,
          "impactScore": 5.9,
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "type": "Secondary"
        }
      ],
      "ssvcV203": [
        {
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "ssvcData": {
            "id": "CVE-2026-100791",
            "options": [
              {
                "exploitation": "none"
              },
              {
                "automatable": "no"
              },
              {
                "technicalImpact": "total"
              }
            ],
            "role": "CISA Coordinator",
            "timestamp": "2026-09-29T00:00:00+00:00",
            "version": "2.0.3"
          }
        }
      ]
    },
    "published": "2026-09-29T13:17:44.133",
    "references": [
      {
        "source": "security@mozilla.org",
        "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=2072433"
      },
      {
        "source": "security@mozilla.org",
        "url": "https://www.mozilla.org/security/advisories/mfsa2026-100/"
      },
      {
        "source": "security@mozilla.org",
        "url": "https://www.mozilla.org/security/advisories/mfsa2026-101/"
      },
      {
        "source": "security@mozilla.org",
        "url": "https://www.mozilla.org/security/advisories/mfsa2026-102/"
      },
      {
        "source": "security@mozilla.org",
        "url": "https://www.mozilla.org/security/advisories/mfsa2026-103/"
      },
      {
        "source": "security@mozilla.org",
        "url": "https://www.mozilla.org/security/advisories/mfsa2026-97/"
      },
      {
        "source": "security@mozilla.org",
        "url": "https://www.mozilla.org/security/advisories/mfsa2026-98/"
      },
      {
        "source": "security@mozilla.org",
        "url": "https://www.mozilla.org/security/advisories/mfsa2026-99/"
      }
    ],
    "sourceIdentifier": "security@mozilla.org",
    "vulnStatus": "Undergoing Analysis",
    "weaknesses": [
      {
        "description": [
          {
            "lang": "en",
            "value": "CWE-416"
          }
        ],
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary"
      }
    ]
  }
}

—

Product

product

NVD

Firefox

receipt

Source: NVD
Its words: Firefox
Read by: field:cve.affected[].affectedData[].product
Said since: 2026-09-29 17:49 UTC
Last answered: 2026-10-06 12:41 UTC
Original: open at the source

What the source handed over

{
  "cve": {
    "affected": [
      {
        "affectedData": [
          {
            "product": "Firefox",
            "vendor": "Mozilla",
            "versions": [
              {
                "lessThanOrEqual": "115.*",
                "status": "unaffected",
                "version": "115.42",
                "versionType": "rpm"
              },
              {
                "lessThanOrEqual": "140.*",
                "status": "unaffected",
                "version": "140.17",
                "versionType": "rpm"
              },
              {
                "lessThanOrEqual": "153.*",
                "status": "unaffected",
                "version": "153.4",
                "versionType": "rpm"
              },
              {
                "lessThanOrEqual": "*",
                "status": "unaffected",
                "version": "157",
                "versionType": "rpm"
              }
            ]
          },
          {
            "product": "Thunderbird",
            "vendor": "Mozilla",
            "versions": [
              {
                "lessThanOrEqual": "140.*",
                "status": "unaffected",
                "version": "140.17",
                "versionType": "rpm"
              },
              {
                "lessThanOrEqual": "153.*",
                "status": "unaffected",
                "version": "153.4",
                "versionType": "rpm"
              },
              {
                "lessThanOrEqual": "*",
                "status": "unaffected",
                "version": "157",
                "versionType": "rpm"
              }
            ]
          }
        ],
        "source": "security@mozilla.org"
      }
    ],
    "cveTags": [],
    "descriptions": [
      {
        "lang": "en",
        "value": "Use-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17."
      }
    ],
    "id": "CVE-2026-100791",
    "lastModified": "2026-09-30T18:18:07.853",
    "metrics": {
      "cvssMetricV31": [
        {
          "cvssData": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "exploitabilityScore": 2.8,
          "impactScore": 5.9,
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "type": "Secondary"
        }
      ],
      "ssvcV203": [
        {
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "ssvcData": {
            "id": "CVE-2026-100791",
            "options": [
              {
                "exploitation": "none"
              },
              {
                "automatable": "no"
              },
              {
                "technicalImpact": "total"
              }
            ],
            "role": "CISA Coordinator",
            "timestamp": "2026-09-29T00:00:00+00:00",
            "version": "2.0.3"
          }
        }
      ]
    },
    "published": "2026-09-29T13:17:44.133",
    "references": [
      {
        "source": "security@mozilla.org",
        "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=2072433"
      },
      {
        "source": "security@mozilla.org",
        "url": "https://www.mozilla.org/security/advisories/mfsa2026-100/"
      },
      {
        "source": "security@mozilla.org",
        "url": "https://www.mozilla.org/security/advisories/mfsa2026-101/"
      },
      {
        "source": "security@mozilla.org",
        "url": "https://www.mozilla.org/security/advisories/mfsa2026-102/"
      },
      {
        "source": "security@mozilla.org",
        "url": "https://www.mozilla.org/security/advisories/mfsa2026-103/"
      },
      {
        "source": "security@mozilla.org",
        "url": "https://www.mozilla.org/security/advisories/mfsa2026-97/"
      },
      {
        "source": "security@mozilla.org",
        "url": "https://www.mozilla.org/security/advisories/mfsa2026-98/"
      },
      {
        "source": "security@mozilla.org",
        "url": "https://www.mozilla.org/security/advisories/mfsa2026-99/"
      }
    ],
    "sourceIdentifier": "security@mozilla.org",
    "vulnStatus": "Undergoing Analysis",
    "weaknesses": [
      {
        "description": [
          {
            "lang": "en",
            "value": "CWE-416"
          }
        ],
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary"
      }
    ]
  }
}

—

Severity

severity

GitHub advisories

high

From 7.0 to 8.9.

receipt

Source: GitHub advisories
Its words: high
Read by: field:severity
Said since: 2026-10-02 11:59 UTC
Last answered: 2026-10-06 13:46 UTC
Original: open at the source

What the source handed over

{
  "credits": [],
  "cve_id": "CVE-2026-100791",
  "cvss": {
    "score": 8.8,
    "vector_string": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"
  },
  "cvss_severities": {
    "cvss_v3": {
      "score": 8.8,
      "vector_string": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"
    },
    "cvss_v4": {
      "score": 0.0,
      "vector_string": null
    }
  },
  "cwes": [
    {
      "cwe_id": "CWE-416",
      "name": "Use After Free"
    }
  ],
  "description": "Use-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox ESR 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17.",
  "epss": {
    "percentage": 0.0034,
    "percentile": 0.25099
  },
  "ghsa_id": "GHSA-94vx-qc4v-5hhg",
  "github_reviewed_at": null,
  "html_url": "https://github.com/advisories/GHSA-94vx-qc4v-5hhg",
  "identifiers": [
    {
      "type": "GHSA",
      "value": "GHSA-94vx-qc4v-5hhg"
    },
    {
      "type": "CVE",
      "value": "CVE-2026-100791"
    }
  ],
  "nvd_published_at": "2026-09-29T13:17:44Z",
  "published_at": "2026-09-29T15:31:28Z",
  "references": [
    "https://nvd.nist.gov/vuln/detail/CVE-2026-100791",
    "https://bugzilla.mozilla.org/show_bug.cgi?id=2072433",
    "https://www.mozilla.org/security/advisories/mfsa2026-100",
    "https://www.mozilla.org/security/advisories/mfsa2026-97",
    "https://www.mozilla.org/security/advisories/mfsa2026-98",
    "https://www.mozilla.org/security/advisories/mfsa2026-99",
    "https://www.mozilla.org/security/advisories/mfsa2026-101",
    "https://www.mozilla.org/security/advisories/mfsa2026-102",
    "https://www.mozilla.org/security/advisories/mfsa2026-103",
    "https://github.com/advisories/GHSA-94vx-qc4v-5hhg"
  ],
  "repository_advisory_url": null,
  "severity": "high",
  "source_code_location": "",
  "summary": "Use-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox ESR 153...",
  "type": "unreviewed",
  "updated_at": "2026-09-30T18:34:15Z",
  "url": "https://api.github.com/advisories/GHSA-94vx-qc4v-5hhg",
  "vulnerabilities": [],
  "withdrawn_at": null
}

—

Severity

severity

NVD

HIGH

From 7.0 to 8.9.

receipt

Source: NVD
Its words: HIGH
Read by: field:cve.metrics.cvssMetricV31[type=Primary].cvssData.baseSeverity || field:cve.metrics.cvssMetricV31[].cvssData.baseSeverity
Said since: 2026-10-06 12:31 UTC
Last answered: 2026-10-06 12:41 UTC
Original: open at the source

2026-10-06 12:31 UTC	HIGH
2026-09-29 17:49 UTC	—

What the source handed over

{
  "cve": {
    "affected": [
      {
        "affectedData": [
          {
            "product": "Firefox",
            "vendor": "Mozilla",
            "versions": [
              {
                "lessThanOrEqual": "115.*",
                "status": "unaffected",
                "version": "115.42",
                "versionType": "rpm"
              },
              {
                "lessThanOrEqual": "140.*",
                "status": "unaffected",
                "version": "140.17",
                "versionType": "rpm"
              },
              {
                "lessThanOrEqual": "153.*",
                "status": "unaffected",
                "version": "153.4",
                "versionType": "rpm"
              },
              {
                "lessThanOrEqual": "*",
                "status": "unaffected",
                "version": "157",
                "versionType": "rpm"
              }
            ]
          },
          {
            "product": "Thunderbird",
            "vendor": "Mozilla",
            "versions": [
              {
                "lessThanOrEqual": "140.*",
                "status": "unaffected",
                "version": "140.17",
                "versionType": "rpm"
              },
              {
                "lessThanOrEqual": "153.*",
                "status": "unaffected",
                "version": "153.4",
                "versionType": "rpm"
              },
              {
                "lessThanOrEqual": "*",
                "status": "unaffected",
                "version": "157",
                "versionType": "rpm"
              }
            ]
          }
        ],
        "source": "security@mozilla.org"
      }
    ],
    "cveTags": [],
    "descriptions": [
      {
        "lang": "en",
        "value": "Use-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17."
      }
    ],
    "id": "CVE-2026-100791",
    "lastModified": "2026-09-30T18:18:07.853",
    "metrics": {
      "cvssMetricV31": [
        {
          "cvssData": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "exploitabilityScore": 2.8,
          "impactScore": 5.9,
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "type": "Secondary"
        }
      ],
      "ssvcV203": [
        {
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "ssvcData": {
            "id": "CVE-2026-100791",
            "options": [
              {
                "exploitation": "none"
              },
              {
                "automatable": "no"
              },
              {
                "technicalImpact": "total"
              }
            ],
            "role": "CISA Coordinator",
            "timestamp": "2026-09-29T00:00:00+00:00",
            "version": "2.0.3"
          }
        }
      ]
    },
    "published": "2026-09-29T13:17:44.133",
    "references": [
      {
        "source": "security@mozilla.org",
        "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=2072433"
      },
      {
        "source": "security@mozilla.org",
        "url": "https://www.mozilla.org/security/advisories/mfsa2026-100/"
      },
      {
        "source": "security@mozilla.org",
        "url": "https://www.mozilla.org/security/advisories/mfsa2026-101/"
      },
      {
        "source": "security@mozilla.org",
        "url": "https://www.mozilla.org/security/advisories/mfsa2026-102/"
      },
      {
        "source": "security@mozilla.org",
        "url": "https://www.mozilla.org/security/advisories/mfsa2026-103/"
      },
      {
        "source": "security@mozilla.org",
        "url": "https://www.mozilla.org/security/advisories/mfsa2026-97/"
      },
      {
        "source": "security@mozilla.org",
        "url": "https://www.mozilla.org/security/advisories/mfsa2026-98/"
      },
      {
        "source": "security@mozilla.org",
        "url": "https://www.mozilla.org/security/advisories/mfsa2026-99/"
      }
    ],
    "sourceIdentifier": "security@mozilla.org",
    "vulnStatus": "Undergoing Analysis",
    "weaknesses": [
      {
        "description": [
          {
            "lang": "en",
            "value": "CWE-416"
          }
        ],
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary"
      }
    ]
  }
}

high

Severity

severity

Red Hat

important

A flaw that can easily compromise confidentiality, integrity or availability.

receipt

Source: Red Hat
Its words: important
Read by: field:severity
Said since: 2026-10-06 13:01 UTC
Last answered: 2026-10-06 13:02 UTC
Original: open at the source

What the source handed over

{
  "CVE": "CVE-2026-100791",
  "CWE": "CWE-825",
  "advisories": [],
  "affected_packages": [],
  "bugzilla": "2543149",
  "bugzilla_description": "firefox: Use-after-free in the DOM: Core & HTML component",
  "cvss3_score": "7.5",
  "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H",
  "cvss_score": null,
  "cvss_scoring_vector": null,
  "package_state": null,
  "public_date": "2026-09-29T12:36:12Z",
  "resource_url": "https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-100791.json",
  "severity": "important"
}

high

Status

status

NVD

Undergoing Analysis

receipt

Source: NVD
Its words: Undergoing Analysis
Read by: field:cve.vulnStatus
Said since: 2026-10-06 11:32 UTC
Last answered: 2026-10-06 12:41 UTC
Original: open at the source

2026-10-06 11:32 UTC	Undergoing Analysis
2026-10-02 12:00 UTC	Awaiting Analysis
2026-09-29 17:49 UTC	Received

What the source handed over

{
  "cve": {
    "affected": [
      {
        "affectedData": [
          {
            "product": "Firefox",
            "vendor": "Mozilla",
            "versions": [
              {
                "lessThanOrEqual": "115.*",
                "status": "unaffected",
                "version": "115.42",
                "versionType": "rpm"
              },
              {
                "lessThanOrEqual": "140.*",
                "status": "unaffected",
                "version": "140.17",
                "versionType": "rpm"
              },
              {
                "lessThanOrEqual": "153.*",
                "status": "unaffected",
                "version": "153.4",
                "versionType": "rpm"
              },
              {
                "lessThanOrEqual": "*",
                "status": "unaffected",
                "version": "157",
                "versionType": "rpm"
              }
            ]
          },
          {
            "product": "Thunderbird",
            "vendor": "Mozilla",
            "versions": [
              {
                "lessThanOrEqual": "140.*",
                "status": "unaffected",
                "version": "140.17",
                "versionType": "rpm"
              },
              {
                "lessThanOrEqual": "153.*",
                "status": "unaffected",
                "version": "153.4",
                "versionType": "rpm"
              },
              {
                "lessThanOrEqual": "*",
                "status": "unaffected",
                "version": "157",
                "versionType": "rpm"
              }
            ]
          }
        ],
        "source": "security@mozilla.org"
      }
    ],
    "cveTags": [],
    "descriptions": [
      {
        "lang": "en",
        "value": "Use-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17."
      }
    ],
    "id": "CVE-2026-100791",
    "lastModified": "2026-09-30T18:18:07.853",
    "metrics": {
      "cvssMetricV31": [
        {
          "cvssData": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "exploitabilityScore": 2.8,
          "impactScore": 5.9,
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "type": "Secondary"
        }
      ],
      "ssvcV203": [
        {
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "ssvcData": {
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              },
              {
                "technicalImpact": "total"
              }
            ],
            "role": "CISA Coordinator",
            "timestamp": "2026-09-29T00:00:00+00:00",
            "version": "2.0.3"
          }
        }
      ]
    },
    "published": "2026-09-29T13:17:44.133",
    "references": [
      {
        "source": "security@mozilla.org",
        "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=2072433"
      },
      {
        "source": "security@mozilla.org",
        "url": "https://www.mozilla.org/security/advisories/mfsa2026-100/"
      },
      {
        "source": "security@mozilla.org",
        "url": "https://www.mozilla.org/security/advisories/mfsa2026-101/"
      },
      {
        "source": "security@mozilla.org",
        "url": "https://www.mozilla.org/security/advisories/mfsa2026-102/"
      },
      {
        "source": "security@mozilla.org",
        "url": "https://www.mozilla.org/security/advisories/mfsa2026-103/"
      },
      {
        "source": "security@mozilla.org",
        "url": "https://www.mozilla.org/security/advisories/mfsa2026-97/"
      },
      {
        "source": "security@mozilla.org",
        "url": "https://www.mozilla.org/security/advisories/mfsa2026-98/"
      },
      {
        "source": "security@mozilla.org",
        "url": "https://www.mozilla.org/security/advisories/mfsa2026-99/"
      }
    ],
    "sourceIdentifier": "security@mozilla.org",
    "vulnStatus": "Undergoing Analysis",
    "weaknesses": [
      {
        "description": [
          {
            "lang": "en",
            "value": "CWE-416"
          }
        ],
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary"
      }
    ]
  }
}

—

Technical impact

technical_impact

NVD

total

The attacker gains full control of the component, or all of its information.

receipt

Source: NVD
Its words: total
Read by: field:cve.metrics.ssvcV203[].ssvcData.options[].technicalImpact
Said since: 2026-10-06 12:31 UTC
Last answered: 2026-10-06 12:41 UTC
Original: open at the source

2026-10-06 12:31 UTC	total
2026-09-29 17:49 UTC	—

What the source handed over

{
  "cve": {
    "affected": [
      {
        "affectedData": [
          {
            "product": "Firefox",
            "vendor": "Mozilla",
            "versions": [
              {
                "lessThanOrEqual": "115.*",
                "status": "unaffected",
                "version": "115.42",
                "versionType": "rpm"
              },
              {
                "lessThanOrEqual": "140.*",
                "status": "unaffected",
                "version": "140.17",
                "versionType": "rpm"
              },
              {
                "lessThanOrEqual": "153.*",
                "status": "unaffected",
                "version": "153.4",
                "versionType": "rpm"
              },
              {
                "lessThanOrEqual": "*",
                "status": "unaffected",
                "version": "157",
                "versionType": "rpm"
              }
            ]
          },
          {
            "product": "Thunderbird",
            "vendor": "Mozilla",
            "versions": [
              {
                "lessThanOrEqual": "140.*",
                "status": "unaffected",
                "version": "140.17",
                "versionType": "rpm"
              },
              {
                "lessThanOrEqual": "153.*",
                "status": "unaffected",
                "version": "153.4",
                "versionType": "rpm"
              },
              {
                "lessThanOrEqual": "*",
                "status": "unaffected",
                "version": "157",
                "versionType": "rpm"
              }
            ]
          }
        ],
        "source": "security@mozilla.org"
      }
    ],
    "cveTags": [],
    "descriptions": [
      {
        "lang": "en",
        "value": "Use-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17."
      }
    ],
    "id": "CVE-2026-100791",
    "lastModified": "2026-09-30T18:18:07.853",
    "metrics": {
      "cvssMetricV31": [
        {
          "cvssData": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "exploitabilityScore": 2.8,
          "impactScore": 5.9,
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "type": "Secondary"
        }
      ],
      "ssvcV203": [
        {
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "ssvcData": {
            "id": "CVE-2026-100791",
            "options": [
              {
                "exploitation": "none"
              },
              {
                "automatable": "no"
              },
              {
                "technicalImpact": "total"
              }
            ],
            "role": "CISA Coordinator",
            "timestamp": "2026-09-29T00:00:00+00:00",
            "version": "2.0.3"
          }
        }
      ]
    },
    "published": "2026-09-29T13:17:44.133",
    "references": [
      {
        "source": "security@mozilla.org",
        "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=2072433"
      },
      {
        "source": "security@mozilla.org",
        "url": "https://www.mozilla.org/security/advisories/mfsa2026-100/"
      },
      {
        "source": "security@mozilla.org",
        "url": "https://www.mozilla.org/security/advisories/mfsa2026-101/"
      },
      {
        "source": "security@mozilla.org",
        "url": "https://www.mozilla.org/security/advisories/mfsa2026-102/"
      },
      {
        "source": "security@mozilla.org",
        "url": "https://www.mozilla.org/security/advisories/mfsa2026-103/"
      },
      {
        "source": "security@mozilla.org",
        "url": "https://www.mozilla.org/security/advisories/mfsa2026-97/"
      },
      {
        "source": "security@mozilla.org",
        "url": "https://www.mozilla.org/security/advisories/mfsa2026-98/"
      },
      {
        "source": "security@mozilla.org",
        "url": "https://www.mozilla.org/security/advisories/mfsa2026-99/"
      }
    ],
    "sourceIdentifier": "security@mozilla.org",
    "vulnStatus": "Undergoing Analysis",
    "weaknesses": [
      {
        "description": [
          {
            "lang": "en",
            "value": "CWE-416"
          }
        ],
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary"
      }
    ]
  }
}

—

Vendor

vendor

NVD

Mozilla

receipt

Source: NVD
Its words: Mozilla
Read by: field:cve.affected[].affectedData[].vendor
Said since: 2026-09-29 17:49 UTC
Last answered: 2026-10-06 12:41 UTC
Original: open at the source

What the source handed over

{
  "cve": {
    "affected": [
      {
        "affectedData": [
          {
            "product": "Firefox",
            "vendor": "Mozilla",
            "versions": [
              {
                "lessThanOrEqual": "115.*",
                "status": "unaffected",
                "version": "115.42",
                "versionType": "rpm"
              },
              {
                "lessThanOrEqual": "140.*",
                "status": "unaffected",
                "version": "140.17",
                "versionType": "rpm"
              },
              {
                "lessThanOrEqual": "153.*",
                "status": "unaffected",
                "version": "153.4",
                "versionType": "rpm"
              },
              {
                "lessThanOrEqual": "*",
                "status": "unaffected",
                "version": "157",
                "versionType": "rpm"
              }
            ]
          },
          {
            "product": "Thunderbird",
            "vendor": "Mozilla",
            "versions": [
              {
                "lessThanOrEqual": "140.*",
                "status": "unaffected",
                "version": "140.17",
                "versionType": "rpm"
              },
              {
                "lessThanOrEqual": "153.*",
                "status": "unaffected",
                "version": "153.4",
                "versionType": "rpm"
              },
              {
                "lessThanOrEqual": "*",
                "status": "unaffected",
                "version": "157",
                "versionType": "rpm"
              }
            ]
          }
        ],
        "source": "security@mozilla.org"
      }
    ],
    "cveTags": [],
    "descriptions": [
      {
        "lang": "en",
        "value": "Use-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17."
      }
    ],
    "id": "CVE-2026-100791",
    "lastModified": "2026-09-30T18:18:07.853",
    "metrics": {
      "cvssMetricV31": [
        {
          "cvssData": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "exploitabilityScore": 2.8,
          "impactScore": 5.9,
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "type": "Secondary"
        }
      ],
      "ssvcV203": [
        {
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "ssvcData": {
            "id": "CVE-2026-100791",
            "options": [
              {
                "exploitation": "none"
              },
              {
                "automatable": "no"
              },
              {
                "technicalImpact": "total"
              }
            ],
            "role": "CISA Coordinator",
            "timestamp": "2026-09-29T00:00:00+00:00",
            "version": "2.0.3"
          }
        }
      ]
    },
    "published": "2026-09-29T13:17:44.133",
    "references": [
      {
        "source": "security@mozilla.org",
        "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=2072433"
      },
      {
        "source": "security@mozilla.org",
        "url": "https://www.mozilla.org/security/advisories/mfsa2026-100/"
      },
      {
        "source": "security@mozilla.org",
        "url": "https://www.mozilla.org/security/advisories/mfsa2026-101/"
      },
      {
        "source": "security@mozilla.org",
        "url": "https://www.mozilla.org/security/advisories/mfsa2026-102/"
      },
      {
        "source": "security@mozilla.org",
        "url": "https://www.mozilla.org/security/advisories/mfsa2026-103/"
      },
      {
        "source": "security@mozilla.org",
        "url": "https://www.mozilla.org/security/advisories/mfsa2026-97/"
      },
      {
        "source": "security@mozilla.org",
        "url": "https://www.mozilla.org/security/advisories/mfsa2026-98/"
      },
      {
        "source": "security@mozilla.org",
        "url": "https://www.mozilla.org/security/advisories/mfsa2026-99/"
      }
    ],
    "sourceIdentifier": "security@mozilla.org",
    "vulnStatus": "Undergoing Analysis",
    "weaknesses": [
      {
        "description": [
          {
            "lang": "en",
            "value": "CWE-416"
          }
        ],
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary"
      }
    ]
  }
}

—

Every claim, by kind

vulnerability

firefox: Use-after-free in the DOM: Core & HTML component zetlyn/cve-redhat · 2026-09-29	cvss 7.5 cvss_vector CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H cwe CWE-825 severity important	source
Use-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17. zetlyn/cve-nvd · 2026-09-29	automatable no cvss 8.8 cvss_vector CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H cwe CWE-416 exploitation none product Firefox severity HIGH status Undergoing Analysis technical_impact total vendor Mozilla	source
Use-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox ESR 153... zetlyn/cve-ghsa · 2026-09-29	cvss 8.8 cwe CWE-416 severity high	source