---
id: CVE-2026-92005
title: 'Use-after-free in the Audio/Video: Web Codecs component'
summary: >-
  Use-after-free in the Audio/Video: Web Codecs component. This vulnerability
  was fixed in Firefox 156, Firefox ESR 140.16, Firefox ESR 153.3, Thunderbird
  156, Thunderbird 140.16, and Thunderbird 153.3.
severity: medium
cvss: 5.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L'
cwe:
  - CWE-416
  - CWE-825
vendor: Mozilla
product: Firefox
affected:
  - Firefox
  - Thunderbird
published: '2026-09-15'
updated: '2026-09-17'
sourceUpdated: '2026-09-17T21:17:53.067'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-92005'
references:
  - url: 'https://bugzilla.mozilla.org/show_bug.cgi?id=2056051'
    label: security@mozilla.org
  - url: 'https://www.mozilla.org/security/advisories/mfsa2026-90/'
    label: security@mozilla.org
  - url: 'https://www.mozilla.org/security/advisories/mfsa2026-92/'
    label: security@mozilla.org
  - url: 'https://www.mozilla.org/security/advisories/mfsa2026-93/'
    label: security@mozilla.org
  - url: 'https://www.mozilla.org/security/advisories/mfsa2026-94/'
    label: security@mozilla.org
  - url: 'https://www.mozilla.org/security/advisories/mfsa2026-95/'
    label: security@mozilla.org
  - url: 'https://www.mozilla.org/security/advisories/mfsa2026-96/'
    label: security@mozilla.org
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-92005.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-92005'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2533778'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-92005'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-92005'
  - url: 'https://www.mozilla.org/security/advisories/mfsa2026-92/#CVE-2026-92005'
  - url: 'https://www.mozilla.org/security/advisories/mfsa2026-95/#CVE-2026-92005'
tags:
  - nvd
  - cve.org
  - csaf
  - vex
  - red-hat
  - score-dispute
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-09-17T20:35:53.633305Z'
epss: 0.00381
epssPercentile: 0.31836
scores:
  nvd: 5.3
  vendor: 7.5
ingestedAt: '2026-09-15T12:36:50.201Z'
---

## Overview

Use-after-free in the Audio/Video: Web Codecs component. This vulnerability was fixed in Firefox 156, Firefox ESR 140.16, Firefox ESR 153.3, Thunderbird 156, Thunderbird 140.16, and Thunderbird 153.3.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Vendor advisories

- **Red Hat VEX** · Important · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9 · no fix planned: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, … · updated 2026-09-16 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-92005.json)