CVE-2026-0878

HIGH SEVERITY

CVSS Score & Metrics

Base Score

8.0 / 10

Vector String

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

Vulnerability Description

Sandbox escape due to incorrect boundary conditions in the Graphics: CanvasWebGL component. This vulnerability affects Firefox < 147, Firefox ESR < 140.7, Thunderbird < 147, and Thunderbird < 140.7.

Vulnerability Details

Published Date

January 13, 2026

Last Modified

January 22, 2026

CWE ID

CWE-20

Source

NVD

Vendor

mozilla

Product

firefox

External References

https://bugzilla.mozilla.org/show_bug.cgi?id=2003989
https://www.mozilla.org/security/advisories/mfsa2026-01/
https://www.mozilla.org/security/advisories/mfsa2026-03/
https://www.mozilla.org/security/advisories/mfsa2026-04/
https://www.mozilla.org/security/advisories/mfsa2026-05/

CVE-2026-0878

CVSS Score & Metrics

Vulnerability Description

Vulnerability Details

External References

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