CVE-2026-5735

CRITICAL CVSS 9.8 View on NVD ↗

Description

Memory safety bugs present in Firefox 149.0.1 and Thunderbird 149.0.1. 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 affects Firefox < 149.0.2 and Thunderbird < 149.0.2.

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected Products

mozilla/firefox mozilla/thunderbird

References

https://bugzilla.mozilla.org/buglist.cgi?bug_id=2025475%2C2025477
https://www.mozilla.org/security/advisories/mfsa2026-25/
https://www.mozilla.org/security/advisories/mfsa2026-28/

Published: Apr 07, 2026 13:16 UTC Modified: Apr 07, 2026 19:16 UTC