Description
Sandbox escape due to incorrect boundary conditions in the Graphics: CanvasWebGL component. This vulnerability was fixed in Firefox 146, Firefox ESR 115.31, Firefox ESR 140.6, Thunderbird 146, and Thunderbird 140.6.
References (6)
Core 6
Core References
Issue Tracking, Permissions Required
https://bugzilla.mozilla.org/show_bug.cgi?id=1996473
Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2025-92/
Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2025-93/
Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2025-94/
Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2025-95/
Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2025-96/
Scores
CVSS v3
8.0
EPSS
0.0028
EPSS Percentile
19.1%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:N
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
no
Technical Impact
total
Details
CWE
CWE-754
Status
published
Products (9)
mozilla/firefox
< 115.31.0
mozilla/firefox
< 146.0
Mozilla/Firefox
115.31 - 115.*
Mozilla/Firefox
140.6 - 140.*
Mozilla/Firefox
146
mozilla/thunderbird
< 140.6.0
mozilla/thunderbird
< 146.0
Mozilla/Thunderbird
140.6 - 140.*
Mozilla/Thunderbird
146
Published
Dec 09, 2025
Tracked Since
Feb 18, 2026