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 vulnerability cve CVE-2026-100791 known 2026-09-29

https://nvd.nist.gov/vuln/detail/CVE-2026-100791

Properties

automatable

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",
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          },
          {
            "product": "Thunderbird",
            "vendor": "Mozilla",
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                "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": [
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            "attackComplexity": "LOW",
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            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
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            "version": "3.1"
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      "ssvcV203": [
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    "references": [
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        "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=2072433"
      },
      {
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        "url": "https://www.mozilla.org/security/advisories/mfsa2026-100/"
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      {
        "source": "security@mozilla.org",
        "url": "https://www.mozilla.org/security/advisories/mfsa2026-101/"
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      },
      {
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        "url": "https://www.mozilla.org/security/advisories/mfsa2026-97/"
      },
      {
        "source": "security@mozilla.org",
        "url": "https://www.mozilla.org/security/advisories/mfsa2026-98/"
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        "url": "https://www.mozilla.org/security/advisories/mfsa2026-99/"
      }
    ],
    "sourceIdentifier": "security@mozilla.org",
    "vulnStatus": "Undergoing Analysis",
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          }
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        "type": "Secondary"
      }
    ]
  }
}

cvss

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"
              }
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          }
        ],
        "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",
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            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
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      "ssvcV203": [
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            "timestamp": "2026-09-29T00:00:00+00:00",
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    "references": [
      {
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        "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/"
      },
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        "url": "https://www.mozilla.org/security/advisories/mfsa2026-102/"
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        "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/"
      },
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        "url": "https://www.mozilla.org/security/advisories/mfsa2026-99/"
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    ],
    "sourceIdentifier": "security@mozilla.org",
    "vulnStatus": "Undergoing Analysis",
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          }
        ],
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary"
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    ]
  }
}

cvss_vector

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": [
              {
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                "status": "unaffected",
                "version": "140.17",
                "versionType": "rpm"
              },
              {
                "lessThanOrEqual": "153.*",
                "status": "unaffected",
                "version": "153.4",
                "versionType": "rpm"
              },
              {
                "lessThanOrEqual": "*",
                "status": "unaffected",
                "version": "157",
                "versionType": "rpm"
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          }
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        "source": "security@mozilla.org"
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    ],
    "cveTags": [],
    "descriptions": [
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      }
    ],
    "id": "CVE-2026-100791",
    "lastModified": "2026-09-30T18:18:07.853",
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        "url": "https://www.mozilla.org/security/advisories/mfsa2026-103/"
      },
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        "url": "https://www.mozilla.org/security/advisories/mfsa2026-97/"
      },
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        "url": "https://www.mozilla.org/security/advisories/mfsa2026-98/"
      },
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        "url": "https://www.mozilla.org/security/advisories/mfsa2026-99/"
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        ],
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary"
      }
    ]
  }
}

cwe

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",
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      }
    ],
    "id": "CVE-2026-100791",
    "lastModified": "2026-09-30T18:18:07.853",
    "metrics": {
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            "confidentialityImpact": "HIGH",
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      "ssvcV203": [
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                "technicalImpact": "total"
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    "references": [
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      },
      {
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        "url": "https://www.mozilla.org/security/advisories/mfsa2026-100/"
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      {
        "source": "security@mozilla.org",
        "url": "https://www.mozilla.org/security/advisories/mfsa2026-101/"
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        "source": "security@mozilla.org",
        "url": "https://www.mozilla.org/security/advisories/mfsa2026-102/"
      },
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        "source": "security@mozilla.org",
        "url": "https://www.mozilla.org/security/advisories/mfsa2026-103/"
      },
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        "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": [
      {
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            "lang": "en",
            "value": "CWE-416"
          }
        ],
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary"
      }
    ]
  }
}

exploitation

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": [],
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      {
        "lang": "en",
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      }
    ],
    "id": "CVE-2026-100791",
    "lastModified": "2026-09-30T18:18:07.853",
    "metrics": {
      "cvssMetricV31": [
        {
          "cvssData": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 8.8,
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            "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",
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          },
          "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"
              }
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            "timestamp": "2026-09-29T00:00:00+00:00",
            "version": "2.0.3"
          }
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    },
    "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",
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          }
        ],
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary"
      }
    ]
  }
}

product

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": {
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            "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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              },
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              }
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          }
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      ]
    },
    "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": [
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            "value": "CWE-416"
          }
        ],
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary"
      }
    ]
  }
}

severity

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": {
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            "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"
      }
    ]
  }
}

status

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": {
            "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"
      }
    ]
  }
}

technical_impact

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": {
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            "options": [
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                "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

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"
      }
    ]
  }
}

Text

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.