Incorrect calculation in Mozilla Firefox and Firefox for Android - CVE-2026-8389

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Main Vulnerability Database Vulnerabilities #VU131169

Incorrect calculation in Mozilla Firefox and Firefox for Android - CVE-2026-8389

Published: May 12, 2026


Vulnerability identifier: #VU131169
CSH Severity: High
CVSS v4.0: 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/E:U/U:Amber
CVE-ID: CVE-2026-8389
CWE-ID: CWE-682
Exploitation vector: Remote access
Exploit availability: No public exploit available
Vendor: Mozilla
Affected software:
Mozilla Firefox
Firefox for Android

Detailed vulnerability description

The vulnerability allows a remote attacker to execute arbitrary code.

The vulnerability exists due to JIT miscompilation in the JavaScript Engine: JIT component when processing crafted JavaScript. A remote attacker can supply specially crafted script content to execute arbitrary code.


How to mitigate CVE-2026-8389

Install security update from vendor's website.

Sources