CVE-2026-124917

critical

Description

Sandbox escape due to use-after-free in the Widget: Gtk component. This vulnerability was fixed in Firefox 160, Firefox ESR 153.7, Thunderbird 160, and Thunderbird 153.7.

References

https://www.mozilla.org/security/advisories/mfsa2026-129/

https://www.mozilla.org/security/advisories/mfsa2026-128/

https://www.mozilla.org/security/advisories/mfsa2026-127/

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

https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-120902

https://bugzilla.mozilla.org/show_bug.cgi?id=2058648

Details

Source: Mitre, NVD

Published: 2026-11-10

Updated: 2026-11-10

Risk Information

CVSS v2

Base Score: 10

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C

Severity: Critical

CVSS v3

Base Score: 9.6

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