firefox: Use-after-free in the Audio/Video: GMP component

cve CVE-2025-14326 2 sources, 2 claims · Watch

Red Hat writes:
firefox: Use-after-free in the Audio/Video: GMP component the claim

Severity they disagree: CRITICAL NVD
moderate Red Hat
CVSS they disagree: 9.8 NVD
6.1 Red Hat
Vendor: Mozilla NVD
Product: Firefox NVD
CWE: CWE-416 NVD

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	low L
Privileges required PR	none N	none N
User interaction UI	none N	required R
Scope S	unchanged U	changed C
Confidentiality C	high H	low L
Integrity I	high H	low L
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

2025-12-09	first spoke of it: Use-after-free in the Audio/Video: GMP component. This vulnerability was fixed in Firefox 146 and Thunderbird 146.	NVD
2025-12-09	first spoke of it: firefox: Use-after-free in the Audio/Video: GMP 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

yes

An attacker can reliably run all of the kill chain's first four steps without a person.

receipt

Source: NVD
Its words: yes
Read by: field:cve.metrics.ssvcV203[].ssvcData.options[].automatable
Said since: 2026-10-06 11:54 UTC
Last answered: 2026-10-06 12:41 UTC
Original: open at the source

2026-10-06 11:54 UTC	yes
2026-10-02 12:00 UTC	—

What the source handed over

{
  "cve": {
    "affected": [
      {
        "affectedData": [
          {
            "product": "Firefox",
            "vendor": "Mozilla",
            "versions": [
              {
                "lessThanOrEqual": "*",
                "status": "unaffected",
                "version": "146",
                "versionType": "rpm"
              }
            ]
          },
          {
            "product": "Thunderbird",
            "vendor": "Mozilla",
            "versions": [
              {
                "lessThanOrEqual": "*",
                "status": "unaffected",
                "version": "146",
                "versionType": "rpm"
              }
            ]
          }
        ],
        "source": "security@mozilla.org"
      }
    ],
    "configurations": [
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                "versionEndExcluding": "146.0",
                "vulnerable": true
              },
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              }
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    "descriptions": [
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      },
      {
        "lang": "es",
        "value": "Uso después de liberación en el componente Audio/Video: GMP. Esta vulnerabilidad afecta a Firefox menor que 146 y Thunderbird menor que 146."
      }
    ],
    "id": "CVE-2025-14326",
    "lastModified": "2026-10-05T15:10:00.590",
    "metrics": {
      "cvssMetricV31": [
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    "published": "2025-12-09T16:17:40.120",
    "references": [
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        "source": "security@mozilla.org",
        "tags": [
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      },
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    "vulnStatus": "Modified",
    "weaknesses": [
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          }
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        "type": "Primary"
      },
      {
        "description": [
          {
            "lang": "en",
            "value": "CWE-416"
          }
        ],
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary"
      }
    ]
  }
}

—

CVSS

cvss

conflict

NVD

9.8

receipt

Source: NVD
Its words: 9.8
Read by: field:cve.metrics.cvssMetricV31[type=Primary].cvssData.baseScore || field:cve.metrics.cvssMetricV31[].cvssData.baseScore
Said since: 2026-10-02 12:00 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": "*",
                "status": "unaffected",
                "version": "146",
                "versionType": "rpm"
              }
            ]
          },
          {
            "product": "Thunderbird",
            "vendor": "Mozilla",
            "versions": [
              {
                "lessThanOrEqual": "*",
                "status": "unaffected",
                "version": "146",
                "versionType": "rpm"
              }
            ]
          }
        ],
        "source": "security@mozilla.org"
      }
    ],
    "configurations": [
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                "versionEndExcluding": "146.0",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:a:mozilla:thunderbird:*:*:*:*:-:*:*:*",
                "matchCriteriaId": "1CB46BC7-512D-45BF-BCF4-73FDDF94DBAF",
                "versionEndExcluding": "146.0",
                "vulnerable": true
              }
            ],
            "negate": false,
            "operator": "OR"
          }
        ]
      }
    ],
    "cveTags": [],
    "descriptions": [
      {
        "lang": "en",
        "value": "Use-after-free in the Audio/Video: GMP component. This vulnerability was fixed in Firefox 146 and Thunderbird 146."
      },
      {
        "lang": "es",
        "value": "Uso después de liberación en el componente Audio/Video: GMP. Esta vulnerabilidad afecta a Firefox menor que 146 y Thunderbird menor que 146."
      }
    ],
    "id": "CVE-2025-14326",
    "lastModified": "2026-10-05T15:10:00.590",
    "metrics": {
      "cvssMetricV31": [
        {
          "cvssData": {
            "attackComplexity": "LOW",
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            "availabilityImpact": "HIGH",
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            "baseSeverity": "CRITICAL",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
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          "impactScore": 5.9,
          "source": "nvd@nist.gov",
          "type": "Primary"
        },
        {
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            "attackVector": "NETWORK",
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            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
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            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
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      "ssvcV203": [
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            "timestamp": "2025-12-11T20:47:02.613216Z",
            "version": "2.0.3"
          }
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    },
    "published": "2025-12-09T16:17:40.120",
    "references": [
      {
        "source": "security@mozilla.org",
        "tags": [
          "Issue Tracking",
          "Permissions Required"
        ],
        "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=1840666"
      },
      {
        "source": "security@mozilla.org",
        "tags": [
          "Vendor Advisory"
        ],
        "url": "https://www.mozilla.org/security/advisories/mfsa2025-92/"
      },
      {
        "source": "security@mozilla.org",
        "tags": [
          "Vendor Advisory"
        ],
        "url": "https://www.mozilla.org/security/advisories/mfsa2025-95/"
      }
    ],
    "sourceIdentifier": "security@mozilla.org",
    "vulnStatus": "Modified",
    "weaknesses": [
      {
        "description": [
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            "lang": "en",
            "value": "CWE-416"
          }
        ],
        "source": "nvd@nist.gov",
        "type": "Primary"
      },
      {
        "description": [
          {
            "lang": "en",
            "value": "CWE-416"
          }
        ],
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary"
      }
    ]
  }
}

—

CVSS

cvss

conflict

Red Hat

6.1

receipt

Source: Red Hat
Its words: 6.1
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-2025-14326",
  "CWE": null,
  "advisories": [],
  "affected_packages": [],
  "bugzilla": "2420514",
  "bugzilla_description": "firefox: Use-after-free in the Audio/Video: GMP component",
  "cvss3_score": "6.1",
  "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
  "cvss_score": null,
  "cvss_scoring_vector": null,
  "package_state": null,
  "public_date": "2025-12-09T13:38:00Z",
  "resource_url": "https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2025-14326.json",
  "severity": "moderate"
}

—

CVSS vector

cvss_vector

not compared

NVD

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

receipt

Source: NVD
Its words: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/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 11:54 UTC
Last answered: 2026-10-06 12:41 UTC
Original: open at the source

2026-10-06 11:54 UTC	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
2026-10-02 12:00 UTC	—

What the source handed over

{
  "cve": {
    "affected": [
      {
        "affectedData": [
          {
            "product": "Firefox",
            "vendor": "Mozilla",
            "versions": [
              {
                "lessThanOrEqual": "*",
                "status": "unaffected",
                "version": "146",
                "versionType": "rpm"
              }
            ]
          },
          {
            "product": "Thunderbird",
            "vendor": "Mozilla",
            "versions": [
              {
                "lessThanOrEqual": "*",
                "status": "unaffected",
                "version": "146",
                "versionType": "rpm"
              }
            ]
          }
        ],
        "source": "security@mozilla.org"
      }
    ],
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                "versionEndExcluding": "146.0",
                "vulnerable": true
              },
              {
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    ],
    "cveTags": [],
    "descriptions": [
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      },
      {
        "lang": "es",
        "value": "Uso después de liberación en el componente Audio/Video: GMP. Esta vulnerabilidad afecta a Firefox menor que 146 y Thunderbird menor que 146."
      }
    ],
    "id": "CVE-2025-14326",
    "lastModified": "2026-10-05T15:10:00.590",
    "metrics": {
      "cvssMetricV31": [
        {
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            "attackComplexity": "LOW",
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            "privilegesRequired": "NONE",
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            "version": "3.1"
          },
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          "impactScore": 5.9,
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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    "references": [
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        "source": "security@mozilla.org",
        "tags": [
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          "Permissions Required"
        ],
        "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=1840666"
      },
      {
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        "tags": [
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        "tags": [
          "Vendor Advisory"
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        "url": "https://www.mozilla.org/security/advisories/mfsa2025-95/"
      }
    ],
    "sourceIdentifier": "security@mozilla.org",
    "vulnStatus": "Modified",
    "weaknesses": [
      {
        "description": [
          {
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            "value": "CWE-416"
          }
        ],
        "source": "nvd@nist.gov",
        "type": "Primary"
      },
      {
        "description": [
          {
            "lang": "en",
            "value": "CWE-416"
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        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary"
      }
    ]
  }
}

—

CVSS vector

cvss_vector

not compared

Red Hat

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

receipt

Source: Red Hat
Its words: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/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:L/PR:N/UI:R/S:C/C:L/I:L/A:N
2026-09-29 09:44 UTC	—

What the source handed over

{
  "CVE": "CVE-2025-14326",
  "CWE": null,
  "advisories": [],
  "affected_packages": [],
  "bugzilla": "2420514",
  "bugzilla_description": "firefox: Use-after-free in the Audio/Video: GMP component",
  "cvss3_score": "6.1",
  "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
  "cvss_score": null,
  "cvss_scoring_vector": null,
  "package_state": null,
  "public_date": "2025-12-09T13:38:00Z",
  "resource_url": "https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2025-14326.json",
  "severity": "moderate"
}

—

CWE

cwe

NVD

CWE-416

receipt

Source: NVD
Its words: CWE-416
Read by: field:cve.weaknesses[].description[].value
Said since: 2026-10-06 12:29 UTC
Last answered: 2026-10-06 12:41 UTC
Original: open at the source

2026-10-06 12:29 UTC	CWE-416
2026-10-06 11:54 UTC	CWE-416, CWE-416
2026-10-02 12:00 UTC	—

What the source handed over

{
  "cve": {
    "affected": [
      {
        "affectedData": [
          {
            "product": "Firefox",
            "vendor": "Mozilla",
            "versions": [
              {
                "lessThanOrEqual": "*",
                "status": "unaffected",
                "version": "146",
                "versionType": "rpm"
              }
            ]
          },
          {
            "product": "Thunderbird",
            "vendor": "Mozilla",
            "versions": [
              {
                "lessThanOrEqual": "*",
                "status": "unaffected",
                "version": "146",
                "versionType": "rpm"
              }
            ]
          }
        ],
        "source": "security@mozilla.org"
      }
    ],
    "configurations": [
      {
        "nodes": [
          {
            "cpeMatch": [
              {
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                "versionEndExcluding": "146.0",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:a:mozilla:thunderbird:*:*:*:*:-:*:*:*",
                "matchCriteriaId": "1CB46BC7-512D-45BF-BCF4-73FDDF94DBAF",
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                "vulnerable": true
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            ],
            "negate": false,
            "operator": "OR"
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    "cveTags": [],
    "descriptions": [
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      ],
      "ssvcV203": [
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        "tags": [
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        "source": "security@mozilla.org",
        "tags": [
          "Vendor Advisory"
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        "type": "Secondary"
      }
    ]
  }
}

—

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 11:54 UTC
Last answered: 2026-10-06 12:41 UTC
Original: open at the source

2026-10-06 11:54 UTC	none
2026-10-02 12:00 UTC	—

What the source handed over

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  "cve": {
    "affected": [
      {
        "affectedData": [
          {
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            "vendor": "Mozilla",
            "versions": [
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                "versionType": "rpm"
              }
            ]
          },
          {
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            "vendor": "Mozilla",
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      },
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      }
    ],
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    "lastModified": "2026-10-05T15:10:00.590",
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        "source": "security@mozilla.org",
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        ],
        "source": "nvd@nist.gov",
        "type": "Primary"
      },
      {
        "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: 2026-10-02 12:00 UTC
Last answered: 2026-10-06 12:41 UTC
Original: open at the source

What the source handed over

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  "cve": {
    "affected": [
      {
        "affectedData": [
          {
            "product": "Firefox",
            "vendor": "Mozilla",
            "versions": [
              {
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                "versionType": "rpm"
              }
            ]
          },
          {
            "product": "Thunderbird",
            "vendor": "Mozilla",
            "versions": [
              {
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                "status": "unaffected",
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                "versionType": "rpm"
              }
            ]
          }
        ],
        "source": "security@mozilla.org"
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    ],
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    ],
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      },
      {
        "lang": "es",
        "value": "Uso después de liberación en el componente Audio/Video: GMP. Esta vulnerabilidad afecta a Firefox menor que 146 y Thunderbird menor que 146."
      }
    ],
    "id": "CVE-2025-14326",
    "lastModified": "2026-10-05T15:10:00.590",
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      },
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      {
        "source": "security@mozilla.org",
        "tags": [
          "Vendor Advisory"
        ],
        "url": "https://www.mozilla.org/security/advisories/mfsa2025-95/"
      }
    ],
    "sourceIdentifier": "security@mozilla.org",
    "vulnStatus": "Modified",
    "weaknesses": [
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            "lang": "en",
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          }
        ],
        "source": "nvd@nist.gov",
        "type": "Primary"
      },
      {
        "description": [
          {
            "lang": "en",
            "value": "CWE-416"
          }
        ],
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary"
      }
    ]
  }
}

—

Severity

severity

conflict

NVD

CRITICAL

From the CVSS base score at 9.0 and above.

receipt

Source: NVD
Its words: CRITICAL
Read by: field:cve.metrics.cvssMetricV31[type=Primary].cvssData.baseSeverity || field:cve.metrics.cvssMetricV31[].cvssData.baseSeverity
Said since: 2026-10-06 11:54 UTC
Last answered: 2026-10-06 12:41 UTC
Original: open at the source

2026-10-06 11:54 UTC	CRITICAL
2026-10-02 12:00 UTC	—

What the source handed over

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    "affected": [
      {
        "affectedData": [
          {
            "product": "Firefox",
            "vendor": "Mozilla",
            "versions": [
              {
                "lessThanOrEqual": "*",
                "status": "unaffected",
                "version": "146",
                "versionType": "rpm"
              }
            ]
          },
          {
            "product": "Thunderbird",
            "vendor": "Mozilla",
            "versions": [
              {
                "lessThanOrEqual": "*",
                "status": "unaffected",
                "version": "146",
                "versionType": "rpm"
              }
            ]
          }
        ],
        "source": "security@mozilla.org"
      }
    ],
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        ]
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    ],
    "cveTags": [],
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    ],
    "id": "CVE-2025-14326",
    "lastModified": "2026-10-05T15:10:00.590",
    "metrics": {
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          "type": "Secondary"
        }
      ],
      "ssvcV203": [
        {
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "ssvcData": {
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        "tags": [
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    ],
    "sourceIdentifier": "security@mozilla.org",
    "vulnStatus": "Modified",
    "weaknesses": [
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            "value": "CWE-416"
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        ],
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        "type": "Primary"
      },
      {
        "description": [
          {
            "lang": "en",
            "value": "CWE-416"
          }
        ],
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary"
      }
    ]
  }
}

critical

Severity

severity

conflict

Red Hat

moderate

A flaw that is harder to exploit, or whose impact is limited.

receipt

Source: Red Hat
Its words: moderate
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-2025-14326",
  "CWE": null,
  "advisories": [],
  "affected_packages": [],
  "bugzilla": "2420514",
  "bugzilla_description": "firefox: Use-after-free in the Audio/Video: GMP component",
  "cvss3_score": "6.1",
  "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
  "cvss_score": null,
  "cvss_scoring_vector": null,
  "package_state": null,
  "public_date": "2025-12-09T13:38:00Z",
  "resource_url": "https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2025-14326.json",
  "severity": "moderate"
}

medium

Status

status

NVD

Modified

receipt

Source: NVD
Its words: Modified
Read by: field:cve.vulnStatus
Said since: 2026-10-02 12:00 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": "*",
                "status": "unaffected",
                "version": "146",
                "versionType": "rpm"
              }
            ]
          },
          {
            "product": "Thunderbird",
            "vendor": "Mozilla",
            "versions": [
              {
                "lessThanOrEqual": "*",
                "status": "unaffected",
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                "versionType": "rpm"
              }
            ]
          }
        ],
        "source": "security@mozilla.org"
      }
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    "configurations": [
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    "lastModified": "2026-10-05T15:10:00.590",
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      "ssvcV203": [
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        "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 11:54 UTC
Last answered: 2026-10-06 12:41 UTC
Original: open at the source

2026-10-06 11:54 UTC	total
2026-10-02 12:00 UTC	—

What the source handed over

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          },
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        "type": "Secondary"
      }
    ]
  }
}

—

Vendor

vendor

NVD

Mozilla

receipt

Source: NVD
Its words: Mozilla
Read by: field:cve.affected[].affectedData[].vendor
Said since: 2026-10-02 12:00 UTC
Last answered: 2026-10-06 12:41 UTC
Original: open at the source

What the source handed over

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            ]
          },
          {
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            "vendor": "Mozilla",
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        "type": "Secondary"
      }
    ]
  }
}

—

Every claim, by kind

vulnerability

firefox: Use-after-free in the Audio/Video: GMP component zetlyn/cve-redhat · 2025-12-09	cvss 6.1 cvss_vector CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N severity moderate	source
Use-after-free in the Audio/Video: GMP component. This vulnerability was fixed in Firefox 146 and Thunderbird 146. zetlyn/cve-nvd · 2025-12-09	automatable yes cvss 9.8 cvss_vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H cwe CWE-416 exploitation none product Firefox severity CRITICAL status Modified technical_impact total vendor Mozilla	source