Incorrect calculation in Mozilla products - CVE-2026-117955
Published: October 27, 2026
Vulnerability identifier: #VU158167
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-2026-117955
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 WebAssembly execution that may disrupt browser operation.
The vulnerability exists due to incorrect code generation in the JavaScript: WebAssembly component when compiling WebAssembly content. A remote attacker can supply crafted content 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-2026-117955
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