Use-After-Free Vulnerability in Firefox Layout Component
CVE-2026-124943

Currently unrated

Key Information:

Vendor: Mozilla
Status: Firefox
Vendor: CVE Published:; 10 November 2026

What is CVE-2026-124943?

A use-after-free vulnerability exists within the Layout component of Firefox. This flaw can lead to unexpected behavior, potentially allowing attackers to execute code in the context of the browser. Users are advised to update to Firefox 160, where this specific vulnerability has been addressed to enhance overall security.

Affected Version(s)

Firefox 160

References

https://bugzilla.mozilla.org/show_bug.cgi?id=2078990

https://www.mozilla.org/security/advisories/mfsa2026-125/

Download the Critical Vulnerability Management Cheat Sheet

Timeline

Vulnerability published
Nov 10, 2026
Vulnerability Reserved
Nov 9, 2026

Credit

Mozilla

CVE-2026-124943 Data

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