Use-After-Free Vulnerability in Firefox ESR Products by Mozilla
CVE-2026-100832

8.8HIGH

Key Information:

Vendor

Mozilla
Status
Firefox
Thunderbird
Vendor
CVE Published:
29 September 2026

What is CVE-2026-100832?

A use-after-free vulnerability exists in the Graphics: Canvas2D component of Firefox ESR products. This flaw can lead to potential memory corruption, allowing attackers to exploit this issue to execute arbitrary code or crash the application. The vulnerability has been addressed in Firefox ESR versions 153.4, 115.42, and 140.17, which include patches to enhance security and mitigate the risks associated with this flaw.

Affected Version(s)

Firefox 115.42

Firefox 140.17

Firefox 153.4

References

https://bugzilla.mozilla.org/show_bug.cgi?id=2072467
https://www.mozilla.org/security/advisories/mfsa2026-100/
https://www.mozilla.org/security/advisories/mfsa2026-102/

CVSS V3.1

Score:
8.8
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
Required
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Mozilla
.