---
id: CVE-2026-16411
title: Memory safety bugs fixed in Thunderbird 153
summary: >-
  Memory safety bugs present in Thunderbird 152. 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 …
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'
cvssSource: adp
vendor: Mozilla
product: Firefox
affected:
  - Firefox
  - Thunderbird
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: total
  timestamp: '2026-07-23T00:00:00+00:00'
published: '2026-07-21'
updated: '2026-10-21'
sourceUpdated: '2026-10-21T13:50:39.933Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-16411'
references:
  - url: >-
      https://bugzilla.mozilla.org/buglist.cgi?bug_id=1420800%2C1598946%2C1767921%2C2013993%2C2025417%2C2027325%2C2027364%2C2029433%2C2029807%2C2029901%2C2029922%2C2030102%2C2030563%2C2032110%2C2037801%2C2042756%2C2044625%2C2045609%2C2047920%2C2048491%2C2048492%2C2048800%2C2050534%2C2050662%2C2050871
    label: Moderate-severity memory safety bugs fixed in Thunderbird 153
  - url: >-
      https://bugzilla.mozilla.org/buglist.cgi?bug_id=2006467%2C2027346%2C2027349%2C2027353%2C2027362%2C2027371%2C2027373%2C2028954%2C2029694%2C2036906%2C2038964%2C2039460%2C2040522%2C2040834%2C2043275%2C2045394%2C2045606%2C2052060
    label: Low-severity memory safety bugs fixed in Thunderbird 153
  - url: 'https://bugzilla.mozilla.org/buglist.cgi?bug_id=2048936%2C2049804'
    label: High-severity memory safety bugs fixed in Thunderbird 153
  - url: 'https://www.mozilla.org/security/advisories/mfsa2026-68/'
  - url: 'https://www.mozilla.org/security/advisories/mfsa2026-71/'
tags:
  - cve.org
epss: 0.00493
epssPercentile: 0.41122
ingestedAt: '2026-10-21T13:57:01.101Z'
---

## Overview

Memory safety bugs present in Thunderbird 152. 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 153 and Thunderbird 153.

## Affected

- `Firefox`
- `Thunderbird`

## Remediation

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