CVE-2026-100799 Uninitialized memory in the Graphics: WebGPU component
Uninitialized memory in WebGPU allows attackers to potentially execute code or disclose information via crafted web content.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-100799?
CVE-2026-100799 is a medium-severity memory corruption vulnerability in Mozilla Firefox, published on 29 Sep 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
Uninitialized memory in the Graphics: WebGPU component. This vulnerability was fixed in Thunderbird 157 and Firefox 157.
Weakness: CWE-457
Which versions are affected by CVE-2026-100799?
It affects 2 products.
Products include Mozilla Firefox, Mozilla Thunderbird.
How do I fix CVE-2026-100799?
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-2026-100799 being exploited?
There is no known exploitation of CVE-2026-100799 in the wild and no public exploit code.
Other vulnerabilities in Mozilla Firefox
Sources
Also known as GHSA-6chf-cfvh-wmv2, UBUNTU-CVE-2026-100799.