CVE-2026-8091 Incorrect boundary conditions in the Audio/Video: Playback component
Incorrect boundary conditions in the Audio/Video Playback component allow attackers to execute arbitrary code via crafted media files.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-8091?
CVE-2026-8091 is a critical memory corruption vulnerability in Mozilla Firefox, published on 7 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Incorrect boundary conditions in the Audio/Video: Playback component. This vulnerability was fixed in Firefox 150, Thunderbird 150, Firefox ESR 140.10.1, Thunderbird 140.10.1, and Firefox ESR 115.35.2.
Which versions are affected by CVE-2026-8091?
It affects 2 products.
Products include Mozilla Firefox, Mozilla Thunderbird.
How do I fix CVE-2026-8091?
Upgrade to a fixed version.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-8091 being exploited?
There is no known exploitation of CVE-2026-8091 in the wild and no public exploit code.
Other vulnerabilities in Mozilla Firefox
Sources
Also known as DEBIAN-CVE-2026-8091, GHSA-jx5x-3wf9-9rhg, OESA-2026-2272, OESA-2026-2273, OESA-2026-2274, UBUNTU-CVE-2026-8091.