Incorrect calculation in Mozilla products - CVE-2026-12299
Published: June 16, 2026
Vulnerability identifier: #VU134610
CSH Severity: High
CVSS v4.0: CVSS:4.0/AV:L/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-2026-12299
CWE-ID: CWE-682
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Mozilla
Affected software:
Mozilla Firefox
Firefox ESR
Firefox for Android
Mozilla Firefox
Firefox ESR
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 DOM: Core & HTML component when executing script. A remote attacker can supply crafted script to execute arbitrary code.
How to mitigate CVE-2026-12299
Install security update from vendor's website.