The vulnerability of the Web Codecs component in browsers Firefox, Firefox ESR, and the email client Thunderbird allows a hacker to execute arbitrary code.

The vulnerability of the Web Codecs component in Firefox browsers, Firefox ESR, and the email client Thunderbird is related to the execution of operations outside of the buffer in memory. Exploiting this vulnerability could allow a remote attacker to execute arbitrary code...

UBUNTU-CVE-2026-4697

Incorrect boundary conditions in the Audio/Video: Web Codecs component. This vulnerability was fixed in Firefox 149, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9...