firefox: thunderbird: Denial-of-service in the SVG component

cve CVE-2026-92077 2 sources, 2 claims · Watch

Red Hat writes:
firefox: thunderbird: Denial-of-service in the SVG component the claim

Severity they disagree: MEDIUM NVD
low Red Hat
CVSS they disagree: 6.5 NVD
3.4 Red Hat
Vendor: Mozilla NVD
Product: Firefox NVD
CWE: CWE-770 NVD
CWE-770 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	changed C
Confidentiality C	none N	low L
Integrity I	none N	none N
Availability A	high H	none N

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

Timeline

2026-09-15	first spoke of it: Denial-of-service in the SVG component. This vulnerability was fixed in Firefox 156, Firefox ESR 153.3, Thunderbird 156, and Thunderbird 153.3.	NVD
2026-09-15	first spoke of it: firefox: thunderbird: Denial-of-service in the SVG component	Red Hat

What it is to other things

affects	mozilla/firefox NVD
affects	mozilla/thunderbird NVD
made_by	mozilla NVD

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 09:45 UTC	—

What the source handed over

{
  "cve": {
    "affected": [
      {
        "affectedData": [
          {
            "product": "Firefox",
            "vendor": "Mozilla",
            "versions": [
              {
                "lessThanOrEqual": "153.*",
                "status": "unaffected",
                "version": "153.3",
                "versionType": "rpm"
              },
              {
                "lessThanOrEqual": "*",
                "status": "unaffected",
                "version": "156",
                "versionType": "rpm"
              }
            ]
          },
          {
            "product": "Thunderbird",
            "vendor": "Mozilla",
            "versions": [
              {
                "lessThanOrEqual": "153.*",
                "status": "unaffected",
                "version": "153.3",
                "versionType": "rpm"
              },
              {
                "lessThanOrEqual": "*",
                "status": "unaffected",
                "version": "156",
                "versionType": "rpm"
              }
            ]
          }
        ],
        "source": "security@mozilla.org"
      }
    ],
    "configurations": [
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                "versionEndExcluding": "153.3.0",
                "vulnerable": true
              },
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    "lastModified": "2026-10-05T19:21:22.490",
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            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
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    "references": [
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        "type": "Secondary"
      }
    ]
  }
}

—

CVSS

cvss

conflict

NVD

6.5

receipt

Source: NVD
Its words: 6.5
Read by: field:cve.metrics.cvssMetricV31[type=Primary].cvssData.baseScore || field:cve.metrics.cvssMetricV31[].cvssData.baseScore
Said since: 2026-09-29 09:45 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": "153.*",
                "status": "unaffected",
                "version": "153.3",
                "versionType": "rpm"
              },
              {
                "lessThanOrEqual": "*",
                "status": "unaffected",
                "version": "156",
                "versionType": "rpm"
              }
            ]
          },
          {
            "product": "Thunderbird",
            "vendor": "Mozilla",
            "versions": [
              {
                "lessThanOrEqual": "153.*",
                "status": "unaffected",
                "version": "153.3",
                "versionType": "rpm"
              },
              {
                "lessThanOrEqual": "*",
                "status": "unaffected",
                "version": "156",
                "versionType": "rpm"
              }
            ]
          }
        ],
        "source": "security@mozilla.org"
      }
    ],
    "configurations": [
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        "nodes": [
          {
            "cpeMatch": [
              {
                "criteria": "cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*",
                "matchCriteriaId": "716987A4-C64C-4D20-9BE8-0A155FE924C1",
                "versionEndExcluding": "153.3.0",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*",
                "matchCriteriaId": "E886B97A-3CF5-49E0-A360-6B176B75CB8E",
                "versionEndExcluding": "156.0.0",
                "versionStartIncluding": "154.0.0",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*",
                "matchCriteriaId": "73AE1D76-5830-42C6-9C38-5A58F8A8CE52",
                "versionEndExcluding": "153.3.0",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*",
                "matchCriteriaId": "7AAB410A-D0F0-4BDB-9FBB-8F8EBCB7EAAF",
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                "versionStartIncluding": "154.0",
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    ],
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      {
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      }
    ],
    "id": "CVE-2026-92077",
    "lastModified": "2026-10-05T19:21:22.490",
    "metrics": {
      "cvssMetricV31": [
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          "cvssData": {
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            "availabilityImpact": "HIGH",
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            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
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            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
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          "impactScore": 3.6,
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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    "references": [
      {
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        "tags": [
          "Permissions Required"
        ],
        "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=2064601"
      },
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        "source": "security@mozilla.org",
        "tags": [
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        "tags": [
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        ],
        "url": "https://www.mozilla.org/security/advisories/mfsa2026-93/"
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        "source": "security@mozilla.org",
        "tags": [
          "Vendor Advisory"
        ],
        "url": "https://www.mozilla.org/security/advisories/mfsa2026-94/"
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    "vulnStatus": "Analyzed",
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        "type": "Secondary"
      }
    ]
  }
}

—

CVSS

cvss

conflict

Red Hat

3.4

receipt

Source: Red Hat
Its words: 3.4
Read by: field:cvss3_score
Said since: 2026-09-29 09:44 UTC
Last answered: 2026-10-06 13:02 UTC
Original: open at the source

What the source handed over

{
  "CVE": "CVE-2026-92077",
  "CWE": "CWE-770",
  "advisories": [],
  "affected_packages": [],
  "bugzilla": "2533803",
  "bugzilla_description": "firefox: thunderbird: Denial-of-service in the SVG component",
  "cvss3_score": "3.4",
  "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:N/A:N",
  "cvss_score": null,
  "cvss_scoring_vector": null,
  "package_state": null,
  "public_date": "2026-09-15T12:34:39Z",
  "resource_url": "https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-92077.json",
  "severity": "low"
}

—

CVSS vector

cvss_vector

not compared

NVD

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

receipt

Source: NVD
Its words: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/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:N/I:N/A:H
2026-09-29 09:45 UTC	—

What the source handed over

{
  "cve": {
    "affected": [
      {
        "affectedData": [
          {
            "product": "Firefox",
            "vendor": "Mozilla",
            "versions": [
              {
                "lessThanOrEqual": "153.*",
                "status": "unaffected",
                "version": "153.3",
                "versionType": "rpm"
              },
              {
                "lessThanOrEqual": "*",
                "status": "unaffected",
                "version": "156",
                "versionType": "rpm"
              }
            ]
          },
          {
            "product": "Thunderbird",
            "vendor": "Mozilla",
            "versions": [
              {
                "lessThanOrEqual": "153.*",
                "status": "unaffected",
                "version": "153.3",
                "versionType": "rpm"
              },
              {
                "lessThanOrEqual": "*",
                "status": "unaffected",
                "version": "156",
                "versionType": "rpm"
              }
            ]
          }
        ],
        "source": "security@mozilla.org"
      }
    ],
    "configurations": [
      {
        "nodes": [
          {
            "cpeMatch": [
              {
                "criteria": "cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*",
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                "versionEndExcluding": "153.3.0",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*",
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    "lastModified": "2026-10-05T19:21:22.490",
    "metrics": {
      "cvssMetricV31": [
        {
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            "attackComplexity": "LOW",
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            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
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          "impactScore": 3.6,
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "type": "Secondary"
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    "references": [
      {
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        ],
        "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=2064601"
      },
      {
        "source": "security@mozilla.org",
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          "Vendor Advisory"
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        ],
        "url": "https://www.mozilla.org/security/advisories/mfsa2026-94/"
      },
      {
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        "tags": [
          "Vendor Advisory"
        ],
        "url": "https://www.mozilla.org/security/advisories/mfsa2026-96/"
      }
    ],
    "sourceIdentifier": "security@mozilla.org",
    "vulnStatus": "Analyzed",
    "weaknesses": [
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            "value": "CWE-770"
          }
        ],
        "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:C/C:L/I:N/A:N

receipt

Source: Red Hat
Its words: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:N/A:N
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

2026-10-06 13:01 UTC	CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:N/A:N
2026-09-29 09:44 UTC	—

What the source handed over

{
  "CVE": "CVE-2026-92077",
  "CWE": "CWE-770",
  "advisories": [],
  "affected_packages": [],
  "bugzilla": "2533803",
  "bugzilla_description": "firefox: thunderbird: Denial-of-service in the SVG component",
  "cvss3_score": "3.4",
  "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:N/A:N",
  "cvss_score": null,
  "cvss_scoring_vector": null,
  "package_state": null,
  "public_date": "2026-09-15T12:34:39Z",
  "resource_url": "https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-92077.json",
  "severity": "low"
}

—

CWE

cwe

NVD

CWE-770

receipt

Source: NVD
Its words: CWE-770
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-770
2026-09-29 09:45 UTC	—

What the source handed over

{
  "cve": {
    "affected": [
      {
        "affectedData": [
          {
            "product": "Firefox",
            "vendor": "Mozilla",
            "versions": [
              {
                "lessThanOrEqual": "153.*",
                "status": "unaffected",
                "version": "153.3",
                "versionType": "rpm"
              },
              {
                "lessThanOrEqual": "*",
                "status": "unaffected",
                "version": "156",
                "versionType": "rpm"
              }
            ]
          },
          {
            "product": "Thunderbird",
            "vendor": "Mozilla",
            "versions": [
              {
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}

—

CWE

cwe

Red Hat

CWE-770

receipt

Source: Red Hat
Its words: CWE-770
Read by: field:CWE
Said since: 2026-09-29 09:44 UTC
Last answered: 2026-10-06 13:02 UTC
Original: open at the source

What the source handed over

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  "advisories": [],
  "affected_packages": [],
  "bugzilla": "2533803",
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  "cvss3_score": "3.4",
  "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:N/A:N",
  "cvss_score": null,
  "cvss_scoring_vector": null,
  "package_state": null,
  "public_date": "2026-09-15T12:34:39Z",
  "resource_url": "https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-92077.json",
  "severity": "low"
}

—

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 09:45 UTC	—

What the source handed over

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}

—

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

2026-09-29 17:49 UTC	Firefox
2026-09-29 09:45 UTC	—

What the source handed over

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}

—

Severity

severity

conflict

NVD

MEDIUM

From 4.0 to 6.9.

receipt

Source: NVD
Its words: MEDIUM
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	MEDIUM
2026-09-29 09:45 UTC	—

What the source handed over

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        ],
        "url": "https://www.mozilla.org/security/advisories/mfsa2026-93/"
      },
      {
        "source": "security@mozilla.org",
        "tags": [
          "Vendor Advisory"
        ],
        "url": "https://www.mozilla.org/security/advisories/mfsa2026-94/"
      },
      {
        "source": "security@mozilla.org",
        "tags": [
          "Vendor Advisory"
        ],
        "url": "https://www.mozilla.org/security/advisories/mfsa2026-96/"
      }
    ],
    "sourceIdentifier": "security@mozilla.org",
    "vulnStatus": "Analyzed",
    "weaknesses": [
      {
        "description": [
          {
            "lang": "en",
            "value": "CWE-770"
          }
        ],
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary"
      }
    ]
  }
}

medium

Severity

severity

conflict

Red Hat

low

A flaw that is unlikely to be exploited, or whose impact is minimal.

receipt

Source: Red Hat
Its words: low
Read by: field:severity
Said since: 2026-09-29 09:44 UTC
Last answered: 2026-10-06 13:02 UTC
Original: open at the source

What the source handed over

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  "CVE": "CVE-2026-92077",
  "CWE": "CWE-770",
  "advisories": [],
  "affected_packages": [],
  "bugzilla": "2533803",
  "bugzilla_description": "firefox: thunderbird: Denial-of-service in the SVG component",
  "cvss3_score": "3.4",
  "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:N/A:N",
  "cvss_score": null,
  "cvss_scoring_vector": null,
  "package_state": null,
  "public_date": "2026-09-15T12:34:39Z",
  "resource_url": "https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-92077.json",
  "severity": "low"
}

—

Status

status

NVD

Analyzed

receipt

Source: NVD
Its words: Analyzed
Read by: field:cve.vulnStatus
Said since: 2026-10-06 00:34 UTC
Last answered: 2026-10-06 12:41 UTC
Original: open at the source

2026-10-06 00:34 UTC	Analyzed
2026-09-29 09:45 UTC	Awaiting Analysis

What the source handed over

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              },
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          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "type": "Secondary"
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      ],
      "ssvcV203": [
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          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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        "url": "https://www.mozilla.org/security/advisories/mfsa2026-93/"
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        "tags": [
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        ],
        "url": "https://www.mozilla.org/security/advisories/mfsa2026-94/"
      },
      {
        "source": "security@mozilla.org",
        "tags": [
          "Vendor Advisory"
        ],
        "url": "https://www.mozilla.org/security/advisories/mfsa2026-96/"
      }
    ],
    "sourceIdentifier": "security@mozilla.org",
    "vulnStatus": "Analyzed",
    "weaknesses": [
      {
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        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary"
      }
    ]
  }
}

—

Technical impact

technical_impact

NVD

partial

The attacker gains limited control, or limited information.

receipt

Source: NVD
Its words: partial
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	partial
2026-09-29 09:45 UTC	—

What the source handed over

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            "vendor": "Mozilla",
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                "versionType": "rpm"
              },
              {
                "lessThanOrEqual": "*",
                "status": "unaffected",
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                "versionType": "rpm"
              }
            ]
          },
          {
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            "vendor": "Mozilla",
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                "versionType": "rpm"
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              {
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                "status": "unaffected",
                "version": "156",
                "versionType": "rpm"
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    "lastModified": "2026-10-05T19:21:22.490",
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            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
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          "impactScore": 3.6,
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "type": "Secondary"
        }
      ],
      "ssvcV203": [
        {
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "ssvcData": {
            "id": "CVE-2026-92077",
            "options": [
              {
                "exploitation": "none"
              },
              {
                "automatable": "no"
              },
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              }
            ],
            "role": "CISA Coordinator",
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    "references": [
      {
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        "tags": [
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        ],
        "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=2064601"
      },
      {
        "source": "security@mozilla.org",
        "tags": [
          "Vendor Advisory"
        ],
        "url": "https://www.mozilla.org/security/advisories/mfsa2026-90/"
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      {
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        "tags": [
          "Vendor Advisory"
        ],
        "url": "https://www.mozilla.org/security/advisories/mfsa2026-93/"
      },
      {
        "source": "security@mozilla.org",
        "tags": [
          "Vendor Advisory"
        ],
        "url": "https://www.mozilla.org/security/advisories/mfsa2026-94/"
      },
      {
        "source": "security@mozilla.org",
        "tags": [
          "Vendor Advisory"
        ],
        "url": "https://www.mozilla.org/security/advisories/mfsa2026-96/"
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    ],
    "sourceIdentifier": "security@mozilla.org",
    "vulnStatus": "Analyzed",
    "weaknesses": [
      {
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            "value": "CWE-770"
          }
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        "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

2026-09-29 17:49 UTC	Mozilla
2026-09-29 09:45 UTC	—

What the source handed over

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  "cve": {
    "affected": [
      {
        "affectedData": [
          {
            "product": "Firefox",
            "vendor": "Mozilla",
            "versions": [
              {
                "lessThanOrEqual": "153.*",
                "status": "unaffected",
                "version": "153.3",
                "versionType": "rpm"
              },
              {
                "lessThanOrEqual": "*",
                "status": "unaffected",
                "version": "156",
                "versionType": "rpm"
              }
            ]
          },
          {
            "product": "Thunderbird",
            "vendor": "Mozilla",
            "versions": [
              {
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                "status": "unaffected",
                "version": "153.3",
                "versionType": "rpm"
              },
              {
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                "status": "unaffected",
                "version": "156",
                "versionType": "rpm"
              }
            ]
          }
        ],
        "source": "security@mozilla.org"
      }
    ],
    "configurations": [
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    "lastModified": "2026-10-05T19:21:22.490",
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            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
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      "ssvcV203": [
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      {
        "source": "security@mozilla.org",
        "tags": [
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        ],
        "url": "https://www.mozilla.org/security/advisories/mfsa2026-94/"
      },
      {
        "source": "security@mozilla.org",
        "tags": [
          "Vendor Advisory"
        ],
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    ],
    "sourceIdentifier": "security@mozilla.org",
    "vulnStatus": "Analyzed",
    "weaknesses": [
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        "type": "Secondary"
      }
    ]
  }
}

—

Every claim, by kind

vulnerability

firefox: thunderbird: Denial-of-service in the SVG component zetlyn/cve-redhat · 2026-09-15	cvss 3.4 cvss_vector CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:N/A:N cwe CWE-770 severity low	source
Denial-of-service in the SVG component. This vulnerability was fixed in Firefox 156, Firefox ESR 153.3, Thunderbird 156, and Thunderbird 153.3. zetlyn/cve-nvd · 2026-09-15	automatable no cvss 6.5 cvss_vector CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H cwe CWE-770 exploitation none product Firefox severity MEDIUM status Analyzed technical_impact partial vendor Mozilla	source