Input validation error in Mozilla Firefox and Firefox for Android - CVE-2026-12319
Published: June 16, 2026
Vulnerability identifier: #VU134641
CSH Severity: Low
CVSS v4: 4.6 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-12319
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to improper input validation in the Audio/Video: Playback component when processing media content. A remote attacker can supply crafted media content to cause a denial of service.
Affected software
Mozilla Firefox
Firefox for Android
Mozilla Thunderbird
Firefox for Android
Mozilla Thunderbird
How to mitigate CVE-2026-12319
Install security update from vendor's website.
Mozilla Firefox - update to 152.0
Firefox for Android - update to 152.0
Mozilla Thunderbird - update to 152.0
Firefox for Android - update to 152.0
Mozilla Thunderbird - update to 152.0