Type conversion in Mozilla Firefox and Firefox for Android - CVE-2026-4724
Published: March 24, 2026
Vulnerability identifier: #VU124329
CSH Severity: High
CVSS v4: 8.6 [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]
CVE-ID: CVE-2026-4724
CWE-ID: CWE-704
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to execute arbitrary code.
The vulnerability exists due to undefined behavior in the Audio/Video component when processing media content. A remote attacker can trick the victim into visiting a specially crafted website to execute arbitrary code.
Affected software
Mozilla Firefox
Firefox for Android
Anolis OS
Fedora
Mozilla Thunderbird
firefox
Firefox for Android
Anolis OS
Fedora
Mozilla Thunderbird
firefox
How to mitigate CVE-2026-4724
Install security update from vendor's website.
Mozilla Firefox - update to 149.0
Firefox for Android - update to 149.0
Mozilla Thunderbird - update to 149.0
firefox - update to 140.9.0-1
firefox - update to 149.0-4.fc42
Firefox for Android - update to 149.0
Mozilla Thunderbird - update to 149.0
firefox - update to 140.9.0-1
firefox - update to 149.0-4.fc42