CVE-2026-117990

CriticalCVSS 9.6/10Last modified Nov 5, 2026

Description

Sandbox escape due to incorrect boundary conditions in the Graphics: WebRender component. This vulnerability was fixed in Firefox 159, Firefox ESR 153.6, Thunderbird 159, and Thunderbird 153.6.

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

CWE-119

Affected software

VendorProductVersions
MozillaFirefox—
MozillaThunderbird—

References

Timeline

Published
Oct 27, 2026
Last modified
Nov 5, 2026
NVD status
Deferred

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CVE-2026-117990: Critical severity, CVSS 9.6 | Vulnix