CVE-2026-120440

MEDIUM 5.3

QuickJS-NG before 0.16.0 Memory Leak via Atomics.store

CVSS Score

5.3

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-401
Vendor	quickjs-ng
Product	quickjs-ng
Published	Nov 2, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

Low

Affected Versions

quickjs-ng / QuickJS-NG

0 < 0.16.0

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/quickjs-ng/quickjs/security/advisories/GHSA-wm7w-r6qf-3c9w github.com: https://github.com/quickjs-ng/quickjs/commit/62951e1bc68711d37aad986ff84ef0fe17038a7e github.com: https://github.com/quickjs-ng/quickjs/releases/tag/v0.16.0 github.com: https://github.com/quickjs-ng/quickjs/blob/v0.15.1/quickjs.c#L61154 vulncheck.com: https://www.vulncheck.com/advisories/quickjs-ng-before-0.16.0-memory-leak-via-atomics-store

Credits

Tristan Madani (Talence Security) Saúl Ibarra Corretgé