CVE-2026-1144 quickjs-ng quickjs Atomics Ops quickjs.c use after free

Medium 5.3 Published 19 Jan 2026 Updated 25 Feb 2026

Remote attackers can exploit a use-after-free flaw in the quickjs-ng JavaScript engine to potentially execute arbitrary code or cause denial of service.

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-2026-1144?

CVE-2026-1144 is a medium-severity use after free vulnerability in quickjs-ng quickjs, published on 19 Jan 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

A vulnerability was detected in quickjs-ng quickjs up to 0.11.0. Affected is an unknown function of the file quickjs.c of the component Atomics Ops Handler. The manipulation results in use after free. The attack can be executed remotely. The exploit is now public and may be used. The patch is identified as ea3e9d77454e8fc9cb3ef3c504e9c16af5a80141. Applying a patch is advised to resolve this issue.

Weakness: CWE-416, CWE-119

Which versions are affected by CVE-2026-1144?

It affects 1 product.

Products include Quickjs-Ng Quickjs.

How do I fix CVE-2026-1144?

Apply the vendor's patch.

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-2026-1144 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-1144 exists.

Sources

Also known as ALPINE-CVE-2026-1144, DEBIAN-CVE-2026-1144, GHSA-2gmr-vqp5-r9qg, UBUNTU-CVE-2026-1144.