CVE-2026-124917

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

Published Nov 10, 2026 CVSS 3.1 · 9.6 Critical EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Debian DLA Debian DLA DLA-4896-1 firefox-esr security update
Debian DLA Debian DLA DLA-4898-1 thunderbird security update
History
Type Values Removed Values Added
Weaknesses CWE-416
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description Sandbox escape due to use-after-free in the Widget: Gtk component. This vulnerability was fixed in Firefox 160, Firefox ESR 153.7, and Thunderbird 160. 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
Type Values Removed Values Added
Description Sandbox escape due to use-after-free in the Widget: Gtk component. This vulnerability was fixed in Firefox 160 and Firefox ESR 153.7. Sandbox escape due to use-after-free in the Widget: Gtk component. This vulnerability was fixed in Firefox 160, Firefox ESR 153.7, and Thunderbird 160.
References
Type Values Removed Values Added
Metrics cvssV3_1

{'score': 9.6, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H'}

Type Values Removed Values Added
Description Sandbox escape due to use-after-free in the Widget: Gtk component. This vulnerability was fixed in Firefox 160 and Firefox ESR 153.7.
Title Sandbox escape due to use-after-free in the Widget: Gtk component
References

Subscriptions

No data.

Weaknesses

Sources

Status
PUBLISHED
Assigner
mozilla
Published
Updated
Nov 12, 2026, 7:34 PM
Reserved
Nov 9, 2026, 2:47 PM
Status
Deferred
Published
Nov 10, 2026, 2:17 PM
Modified
Nov 12, 2026, 8:18 PM
Severity
Moderate
Public date
Nov 10, 2026, 1:28 PM