CVE-2026-4684

HIGH mozilla NVD

CVSS Score 7.5

Severity HIGH

Published Mar 24, 2026

Vendor mozilla

Description

Race condition, use-after-free in the Graphics: WebRender component. This vulnerability affects Firefox < 149, Firefox ESR < 115.34, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.

References

https://bugzilla.mozilla.org/show_bug.cgi?id=2011129
https://www.mozilla.org/security/advisories/mfsa2026-20/
https://www.mozilla.org/security/advisories/mfsa2026-21/
https://www.mozilla.org/security/advisories/mfsa2026-22/
https://www.mozilla.org/security/advisories/mfsa2026-23/