Buffer overflow in Mozilla products - CVE-2026-74946
Published: August 18, 2026
Vulnerability identifier: #VU144052
CSH Severity: High
CVSS v4: 8.4 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-74946
CWE-ID: CWE-119
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to escalate privileges.
The vulnerability exists due to incorrect boundary conditions in the Graphics: CanvasWebGL component when rendering web content. A remote attacker can cause the browser to process crafted content to escalate privileges.
Affected software
Mozilla Firefox
Firefox ESR
Firefox for Android
Firefox ESR
Firefox for Android
How to mitigate CVE-2026-74946
Install security update from vendor's website.
Mozilla Firefox - update to 154.0
Firefox for Android - update to 154.0
Firefox ESR - addressed in versions 115.39.0, 140.14.0, 153.1.0
Firefox for Android - update to 154.0
Firefox ESR - addressed in versions 115.39.0, 140.14.0, 153.1.0
External References
- https://www.mozilla.org/en-US/security/advisories/mfsa2026-75/
- https://www.mozilla.org/en-US/security/advisories/mfsa2026-77/
- https://www.mozilla.org/en-US/security/advisories/mfsa2026-76/
- https://www.mozilla.org/en-US/security/advisories/mfsa2026-74/
- https://bugzilla.mozilla.org/show_bug.cgi?id=2059997