Incorrect calculation in Mozilla products - CVE-2026-117890
Published: October 27, 2026
Vulnerability identifier: #VU158150
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-2026-117890
CWE-ID: CWE-682
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause incorrect script execution that may disrupt browser operation.
The vulnerability exists due to incorrect code generation in the JavaScript Engine: JIT component when compiling scripts. A remote attacker can supply crafted scripts to trigger miscompilation and potentially cause incorrect execution or browser instability.
Affected software
Firefox ESR
Mozilla Firefox
Firefox for Android
Mozilla Firefox
Firefox for Android
How to mitigate CVE-2026-117890
Install security update from vendor's website.
Firefox ESR - update to 153.6.0
Firefox for Android - update to 159.0
Mozilla Firefox - update to 159.0
Firefox for Android - update to 159.0
Mozilla Firefox - update to 159.0