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CVE-2026-124917

CriticalCVSS 9.6/10Last modified Nov 12, 2026

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.

Metrics

CVSS 3.1 9.6/10CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

Weakness enumeration

Affected software

Vendor	Product	Versions
Mozilla	Firefox	—
Mozilla	Thunderbird	—

References

Timeline

Published: Nov 10, 2026
Last modified: Nov 12, 2026
NVD status: Deferred

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CVE-2026-124917: Critical severity, CVSS 9.6 | Vulnix