Paper/Archive/CVE-2026-124917

CVE-2026-124917

Mozilla Firefox — Sandbox escape due to use-after-free in the Widget: Gtk component

critical.is priorityof 100

29

CVSS 9.6 (ADP)9.6 / 10 × 3028.8 Not in CISA KEV+300.0 No EPSS score.000 × 200.0 No public exploit+100.0 SSVC exploitation: none+100.0

Description · from the CVE record

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

Affected

ProductAffectedFixed inSource

Firefoxsee advisory153.7CNA

Scores by source

CISA ADP9.6CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

CISA ADPSSVCExploitation: none · Automatable: no · Technical impact: total

References

refbugzilla.mozilla.org/show_bug.cgi?id=2058648 refmozilla.org/security/advisories/mfsa2026-125 refmozilla.org/security/advisories/mfsa2026-127