CVE-2026-4725

Sandbox escape due to use-after-free in the Graphics: Canvas2D component. This vulnerability was fixed in Firefox 149 and Thunderbird 149.

Score

CVSS 3.1 10.0 Critical

Status

Modified - security@mozilla.org

Published

2026-03-24

Last modified

2026-04-13

Weaknesses

CWE-416

Affected products

• Firefox (Mozilla)
• Thunderbird (Mozilla)

References

• https://bugzilla.mozilla.org/show_bug.cgi?id=2017108
• https://www.mozilla.org/security/advisories/mfsa2026-20/
• https://www.mozilla.org/security/advisories/mfsa2026-23/