Input validation error in Mozilla products - CVE-2026-117942
Published: October 27, 2026
Vulnerability identifier: #VU158123
CSH Severity: Low
CVSS v4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-117942
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to potentially disrupt script processing or cause a denial of service.
The vulnerability exists due to improper handling of boundary conditions in the JavaScript engine's just-in-time compilation component when processing scripts. A remote attacker can supply crafted script content to trigger incorrect boundary handling and potentially disrupt script execution or browser operation.
Affected software
Mozilla Firefox
Firefox ESR
Firefox for Android
Firefox ESR
Firefox for Android
How to mitigate CVE-2026-117942
Install security update from vendor's website.
Mozilla Firefox - update to 159.0
Firefox for Android - update to 159.0
Firefox ESR - addressed in versions 115.44.0, 153.6.0
Firefox for Android - update to 159.0
Firefox ESR - addressed in versions 115.44.0, 153.6.0