CVE-2026-92005 Use-after-free in the Audio/Video: Web Codecs component
A use-after-free flaw in the Web Codecs component allows attackers to execute arbitrary code, requiring users to upgrade Firefox and Thunderbird.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-92005?
CVE-2026-92005 is a medium-severity use after free vulnerability in Mozilla Firefox, published on 15 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Use-after-free in the Audio/Video: Web Codecs component. This vulnerability was fixed in Firefox 156, Firefox ESR 140.16, Firefox ESR 153.3, Thunderbird 156, Thunderbird 140.16, and Thunderbird 153.3.
Weakness: CWE-416
Which versions are affected by CVE-2026-92005?
It affects 2 products.
Products include Mozilla Firefox, Mozilla Thunderbird.
How do I fix CVE-2026-92005?
Upgrade to a fixed version.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2026-92005 being exploited?
There is no known exploitation of CVE-2026-92005 in the wild and no public exploit code.
Other vulnerabilities in Mozilla Firefox
Sources
Also known as DEBIAN-CVE-2026-92005, GHSA-c7h2-74jc-fjxf, UBUNTU-CVE-2026-92005.