Critical Severity Vulnerability
This vulnerability has been rated as Critical severity. Immediate action is recommended.
CVE-2026-0879
Critical
Low
Medium
High
Critical
9.8
CVSS Score
Published: Jan 13, 2026
Last Modified: Jan 14, 2026
Vulnerability Description
Sandbox escape due to incorrect boundary conditions in the Graphics component. This vulnerability affects Firefox < 147, Firefox ESR < 115.32, and Firefox ESR < 140.7.
CVSS Metrics
Common Vulnerability Scoring System
Vector String:
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector
N
Attack Complexity
L
Privileges Required
N
User Interaction
N
Scope
U
Confidentiality
H
Integrity
H
Availability
H
References & Resources
-
https://bugzilla.mozilla.org/show_bug.cgi?id=2004602security@mozilla.org
-
https://www.mozilla.org/security/advisories/mfsa2026-01/security@mozilla.org
-
https://www.mozilla.org/security/advisories/mfsa2026-02/security@mozilla.org
-
https://www.mozilla.org/security/advisories/mfsa2026-03/security@mozilla.org
Severity Details
9.8
out of 10.0
Critical
Key Information
- Published Date
- January 13, 2026
