---
id: CVE-2025-8044
title: Memory safety bugs present in Firefox 140 and Thunderbird 140
summary: >-
  Memory safety bugs present in 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
  vulnerabili…
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 < 141.0
  - thunderbird < 141.0
patched:
  - firefox 141.0
  - thunderbird 141.0
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-2025-8044'
references:
  - url: 'https://bugzilla.mozilla.org/buglist.cgi?bug_id=1933572%2C1971116'
    label: security@mozilla.org
  - url: 'https://www.mozilla.org/security/advisories/mfsa2025-56/'
    label: security@mozilla.org
  - url: 'https://www.mozilla.org/security/advisories/mfsa2025-61/'
    label: security@mozilla.org
tags:
  - nvd
epss: 0.00444
epssPercentile: 0.36193
ingestedAt: '2026-09-30T18:17:24.452Z'
---

## Overview

Memory safety bugs present in 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 and Thunderbird 141.

## Affected

- `firefox < 141.0`
- `thunderbird < 141.0`

## Remediation

Upgrade past the affected range:

- `firefox 141.0`
- `thunderbird 141.0`