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Back to active CVEs
Medium · CVSS 6.9CVE-2026-120440

QuickJS-NG before 0.16.0 Memory Leak via Atomics.storeCVE-2026-120440

Answer in brief

CVE-2026-120440 records a Medium severity (CVSS 6.9) vulnerability in QuickJS-NG before 0.16.0 Memory Leak via Atomics.store. The current sources do not mark it as known exploited. The current feed maps quickjs-ng/QuickJS-NG (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Nov 2, 2026Updated Nov 2, 2026Source checked Nov 2, 2026First seen by HOL Nov 2, 2026Material review Nov 2, 2026
Upstream Advisory

Key facts

Risk
Medium · CVSS 6.9
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Available

Why this deserves its current priority

CVSS is 6.9. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps quickjs-ng/QuickJS-NG (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
quickjs-ng/QuickJS-NGgeneric>=0 <0.16.00.16.0

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for quickjs-ng/QuickJS-NG.
  2. 2Review the reported fix. Update quickjs-ng/QuickJS-NG to 0.16.0 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Nov 2, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Nov 2, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Nov 2, 2026

Sources and claim methodology

  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • Source referencevulncheck.com
Upstream source description

QuickJS-NG before 0.16.0 contains a memory leak vulnerability in js_atomics_store() in quickjs.c that fails to free the converted value when returning a RangeError. Attackers running JavaScript can repeatedly call Atomics.store with a valueOf that detaches or shrinks the buffer to exhaust heap memory and cause denial of service.

Quoted source text, attributed separately from HOL analysis.

Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
CWE-401
Source
CVE List V5
Source checked
Nov 2, 2026
References
5 linked sources
Open source record