---
id: CVE-2025-9179
title: >-
  An attacker was able to perform memory corruption in the GMP process which
  processes encrypted media
summary: >-
  An attacker was able to perform memory corruption in the GMP process which
  processes encrypted media. This process is also heavily sandboxed, but
  represents slightly different privileges from the content process. This
  vulnerability was f…
severity: critical
cvss: 9.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-119
vendor: mozilla
product: firefox
affected:
  - firefox < 115.27.0
  - firefox < 142.0
  - 'firefox >= 128.0, < 128.14.0'
  - 'firefox >= 140.0, < 140.2.0'
  - thunderbird < 128.14.0
  - thunderbird < 142.0
  - 'thunderbird >= 140.0, < 140.2.0'
patched:
  - firefox 140.2.0
  - thunderbird 140.2.0
published: '2025-08-19'
updated: '2026-09-30'
sourceUpdated: '2026-09-30T18:10:00.190'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-9179'
references:
  - url: 'https://bugzilla.mozilla.org/show_bug.cgi?id=1979527'
    label: security@mozilla.org
  - url: 'https://www.mozilla.org/security/advisories/mfsa2025-64/'
    label: security@mozilla.org
  - url: 'https://www.mozilla.org/security/advisories/mfsa2025-65/'
    label: security@mozilla.org
  - url: 'https://www.mozilla.org/security/advisories/mfsa2025-66/'
    label: security@mozilla.org
  - url: 'https://www.mozilla.org/security/advisories/mfsa2025-67/'
    label: security@mozilla.org
  - url: 'https://www.mozilla.org/security/advisories/mfsa2025-70/'
    label: security@mozilla.org
  - url: 'https://www.mozilla.org/security/advisories/mfsa2025-71/'
    label: security@mozilla.org
  - url: 'https://www.mozilla.org/security/advisories/mfsa2025-72/'
    label: security@mozilla.org
  - url: 'https://lists.debian.org/debian-lts-announce/2025/08/msg00016.html'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://lists.debian.org/debian-lts-announce/2025/08/msg00018.html'
    label: af854a3a-2127-422b-91ae-364da2661108
tags:
  - nvd
epss: 0.00588
epssPercentile: 0.46097
ingestedAt: '2026-09-30T18:17:24.456Z'
---

## Overview

An attacker was able to perform memory corruption in the GMP process which processes encrypted media. This process is also heavily sandboxed, but represents slightly different privileges from the content process. This vulnerability was fixed in Firefox 142, Firefox ESR 115.27, Firefox ESR 128.14, Firefox ESR 140.2, Thunderbird 142, Thunderbird 128.14, and Thunderbird 140.2.

## Affected

- `firefox < 115.27.0`
- `firefox < 142.0`
- `firefox >= 128.0, < 128.14.0`
- `firefox >= 140.0, < 140.2.0`
- `thunderbird < 128.14.0`
- `thunderbird < 142.0`
- `thunderbird >= 140.0, < 140.2.0`

## Remediation

Upgrade past the affected range:

- `firefox 140.2.0`
- `thunderbird 140.2.0`