CVE-2026-2795 Use-after-free in the JavaScript: GC component

High 8.8 Published 24 Feb 2026 Updated 15 Jul 2026

A use-after-free flaw in the JavaScript garbage collector allows attackers to execute arbitrary code, requiring users to upgrade to Firefox 148.

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-2026-2795?

CVE-2026-2795 is a high-severity use after free vulnerability in Mozilla Firefox, published on 24 Feb 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

Use-after-free in the JavaScript: GC component. This vulnerability was fixed in Firefox 148 and Thunderbird 148.

Weakness: CWE-416

Which versions are affected by CVE-2026-2795?

It affects 2 products.

Products include Mozilla Firefox, Mozilla Thunderbird.

How do I fix CVE-2026-2795?

Upgrade to a fixed version.

Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.

Is CVE-2026-2795 being exploited?

There is no known exploitation of CVE-2026-2795 in the wild and no public exploit code.

All Mozilla Firefox vulnerabilities

Sources

Also known as GHSA-8g7m-g6r7-rqcp, UBUNTU-CVE-2026-2795.