Use-after-free in Mozilla Firefox and Firefox for Android - CVE-2026-118022
Published: October 27, 2026
Vulnerability identifier: #VU158225
CSH Severity: High
CVSS v4: 8.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-118022
CWE-ID: CWE-416
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to escape sandbox restrictions.
The vulnerability exists due to use-after-free in Firefox's Disability Access APIs component when handling accessibility operations. A remote attacker can trigger access to freed memory to access capabilities outside the intended sandbox.
Affected software
Mozilla Firefox
Firefox for Android
Firefox for Android
How to mitigate CVE-2026-118022
Install security update from vendor's website.
Mozilla Firefox - update to 159.0
Firefox for Android - update to 159.0
Firefox for Android - update to 159.0