CVE-2026-5733 Incorrect boundary conditions in the Graphics: WebGPU component

High 8.8 Published 7 Apr 2026 Updated 15 Jul 2026

Incorrect boundary conditions in the WebGPU component allow attackers to execute arbitrary code 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-2026-5733?

CVE-2026-5733 is a high-severity memory corruption vulnerability in Mozilla Firefox, published on 7 Apr 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

Incorrect boundary conditions in the Graphics: WebGPU component. This vulnerability was fixed in Firefox 149.0.2 and Thunderbird 149.0.2.

Weakness: CWE-787, CWE-119

Which versions are affected by CVE-2026-5733?

It affects 1 product.

Products include Mozilla Firefox.

How do I fix CVE-2026-5733?

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-2026-5733 being exploited?

There is no known exploitation of CVE-2026-5733 in the wild and no public exploit code.

All Mozilla Firefox vulnerabilities

Sources

Also known as GHSA-qh3h-3qgq-cxv8, UBUNTU-CVE-2026-5733.