Reliance on undefined behavior in Mozilla products - CVE-2026-124935
Published: November 10, 2026
Vulnerability identifier: #VU164561
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-2026-124935
CWE-ID: CWE-758
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to trigger unpredictable behavior that may disrupt real-time communication.
The vulnerability exists due to reliance on undefined behavior in the WebRTC: Networking component when processing real-time communication traffic. A remote attacker can trigger the affected processing path to potentially disrupt browser operation.
Affected software
Firefox ESR
Mozilla Firefox
Firefox for Android
Mozilla Firefox
Firefox for Android
How to mitigate CVE-2026-124935
Install security update from vendor's website.
Firefox ESR - update to 153.7.0
Firefox for Android - update to 160.0
Mozilla Firefox - update to 160.0
Firefox for Android - update to 160.0
Mozilla Firefox - update to 160.0