Buffer overflow in Mozilla Firefox and Firefox for Android - CVE-2026-0892
Published: January 13, 2026
Vulnerability identifier: #VU121222
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-2026-0892
CWE-ID: CWE-119
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to a boundary error when processing HTML content. A remote attacker can create a specially crafted website, trick the victim into opening it, trigger memory corruption and execute arbitrary code on the target system.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
Affected software
Mozilla Firefox
Firefox for Android
Anolis OS
Mozilla Thunderbird
firefox
Firefox for Android
Anolis OS
Mozilla Thunderbird
firefox
How to mitigate CVE-2026-0892
Install updates from vendor's website.
Mozilla Firefox - update to 147.0
Firefox for Android - update to 147.0
Mozilla Thunderbird - update to 147.0
firefox - update to 140.7.0-1
Firefox for Android - update to 147.0
Mozilla Thunderbird - update to 147.0
firefox - update to 140.7.0-1