Use-after-free in Firefox for Android and Mozilla Firefox - CVE-2026-2804
Published: February 25, 2026
Vulnerability identifier: #VU123241
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-2026-2804
CWE-ID: CWE-416
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to crash the browser.
The vulnerability exists due to a use-after-free error in the JavaScript: WebAssembly component. A remote attacker can trick the victim into visiting a specially crafted website and crash the browser.
Affected software
Firefox for Android
Mozilla Firefox
Anolis OS
Mozilla Thunderbird
firefox
Mozilla Firefox
Anolis OS
Mozilla Thunderbird
firefox
How to mitigate CVE-2026-2804
Install updates from vendor's website.
Firefox for Android - update to 148.0
Mozilla Firefox - update to 148.0
Mozilla Thunderbird - update to 148.0
firefox - update to 140.8.0-1
Mozilla Firefox - update to 148.0
Mozilla Thunderbird - update to 148.0
firefox - update to 140.8.0-1