---
id: CVE-2025-8035
title: >-
  Memory safety bugs present in Firefox ESR 128.12, Thunderbird ESR 128.12,
  Firefox ESR 140.0, Thunderbird ESR 140.0, Firefox 140 and Thunderbird 140
summary: >-
  Memory safety bugs present in Firefox ESR 128.12, Thunderbird ESR 128.12,
  Firefox ESR 140.0, Thunderbird ESR 140.0, Firefox 140 and Thunderbird 140.
  Some of these bugs showed evidence of memory corruption and we presume that
  with enough …
severity: high
cvss: 8.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H'
cwe:
  - CWE-119
vendor: mozilla
product: firefox
affected:
  - firefox < 128.13.0
  - firefox < 141.0
  - 'firefox >= 140.0, < 140.1.0'
  - thunderbird < 128.13.0
  - thunderbird < 141.0
  - 'thunderbird >= 140.0, < 140.1.0'
patched:
  - firefox 140.1.0
  - thunderbird 140.1.0
published: '2025-07-22'
updated: '2026-09-30'
sourceUpdated: '2026-09-30T18:10:00.190'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-8035'
references:
  - url: 'https://bugzilla.mozilla.org/show_bug.cgi?id=1975961'
    label: security@mozilla.org
  - url: 'https://www.mozilla.org/security/advisories/mfsa2025-56/'
    label: security@mozilla.org
  - url: 'https://www.mozilla.org/security/advisories/mfsa2025-58/'
    label: security@mozilla.org
  - url: 'https://www.mozilla.org/security/advisories/mfsa2025-59/'
    label: security@mozilla.org
  - url: 'https://www.mozilla.org/security/advisories/mfsa2025-61/'
    label: security@mozilla.org
  - url: 'https://www.mozilla.org/security/advisories/mfsa2025-62/'
    label: security@mozilla.org
  - url: 'https://www.mozilla.org/security/advisories/mfsa2025-63/'
    label: security@mozilla.org
  - url: 'https://lists.debian.org/debian-lts-announce/2025/07/msg00016.html'
    label: af854a3a-2127-422b-91ae-364da2661108
tags:
  - nvd
epss: 0.00352
epssPercentile: 0.26415
ingestedAt: '2026-09-30T18:17:24.449Z'
---

## Overview

Memory safety bugs present in Firefox ESR 128.12, Thunderbird ESR 128.12, Firefox ESR 140.0, Thunderbird ESR 140.0, Firefox 140 and Thunderbird 140. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 141, Firefox ESR 128.13, Firefox ESR 140.1, Thunderbird 141, Thunderbird 128.13, and Thunderbird 140.1.

## Affected

- `firefox < 128.13.0`
- `firefox < 141.0`
- `firefox >= 140.0, < 140.1.0`
- `thunderbird < 128.13.0`
- `thunderbird < 141.0`
- `thunderbird >= 140.0, < 140.1.0`

## Remediation

Upgrade past the affected range:

- `firefox 140.1.0`
- `thunderbird 140.1.0`