Executive brief
Mozilla Firefox contains a vulnerability in its audio and video playback component. An attacker could exploit this flaw to potentially crash the browser or execute unauthorized code when a user views specially crafted media content. This could lead to the theft of sensitive information or a complete compromise of the user's browsing session.
Technical details
An integer overflow vulnerability was identified in the Audio/Video: Playback component of Mozilla Firefox. The flaw occurs during the processing of media streams, where improper calculation of buffer sizes or offsets can lead to memory corruption. An attacker can exploit this by enticing a user to visit a malicious website or play a specially crafted audio/video file. Successful exploitation could allow for arbitrary code execution within the context of the browser process or cause a denial-of-service (browser crash). The vulnerability is addressed in Firefox version 153.
Affected products
- Mozilla Firefox < 153
Timeline
- 2026-07-21: disclosed
- 2026-07-21: advisory
- 2026-07-21: patched