CVE-2026-4724 Undefined behavior in the Audio/Video component
Undefined behavior in the Audio/Video component allows attackers to potentially execute arbitrary code via crafted media content.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-4724?
CVE-2026-4724 is a critical memory corruption vulnerability in Mozilla Firefox, published on 24 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Undefined behavior in the Audio/Video component. This vulnerability was fixed in Firefox 149 and Thunderbird 149.
Weakness: CWE-758
Which versions are affected by CVE-2026-4724?
It affects 2 products.
Products include Mozilla Firefox, Mozilla Thunderbird.
How do I fix CVE-2026-4724?
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-2026-4724 being exploited?
There is no known exploitation of CVE-2026-4724 in the wild and no public exploit code.
Other vulnerabilities in Mozilla Firefox
Sources
Also known as GHSA-j97q-98f4-5wq3, UBUNTU-CVE-2026-4724.