---
id: CVE-2026-100805
title: 'Race condition, use-after-free in the Audio/Video component'
summary: >-
  Race condition, use-after-free in the Audio/Video component. This
  vulnerability was fixed in Thunderbird 157 and Firefox 157.
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H'
cwe:
  - CWE-362
  - CWE-416
  - CWE-825
vendor: Mozilla
product: Firefox
affected:
  - Firefox
published: '2026-09-29'
updated: '2026-09-30'
sourceUpdated: '2026-09-30T18:18:09.797'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-100805'
references:
  - url: 'https://bugzilla.mozilla.org/show_bug.cgi?id=2058785'
    label: security@mozilla.org
  - url: 'https://www.mozilla.org/security/advisories/mfsa2026-101/'
    label: security@mozilla.org
  - url: 'https://www.mozilla.org/security/advisories/mfsa2026-97/'
    label: security@mozilla.org
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-100805.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-100805'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2543175'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-100805'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-100805'
  - url: 'https://www.mozilla.org/security/advisories/mfsa2026-97/#CVE-2026-100805'
tags:
  - nvd
  - cve.org
  - csaf
  - vex
  - red-hat
epss: 0.00208
epssPercentile: 0.10873
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-09-29T14:09:34.466424Z'
ingestedAt: '2026-09-29T13:34:31.671Z'
scores:
  nvd: 7.5
  vendor: 6.1
---

## Overview

Race condition, use-after-free in the Audio/Video component. This vulnerability was fixed in Thunderbird 157 and Firefox 157.

## Remediation

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

## Vendor advisories

- **Red Hat VEX** · Moderate · updated 2026-10-16 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-100805.json)