Use-after-free in Mozilla products - CVE-2026-74973
Published: August 18, 2026
Vulnerability identifier: #VU144055
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-2026-74973
CWE-ID: CWE-416
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to execute arbitrary code.
The vulnerability exists due to a race condition leading to use-after-free in the Graphics component when rendering content. A remote attacker can cause the browser to process crafted content to execute arbitrary code.
Affected software
Mozilla Firefox
Firefox ESR
Firefox for Android
Firefox ESR
Firefox for Android
How to mitigate CVE-2026-74973
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=2060357