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CVE-2026-120440 Details

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.

Metrics

CVSS 3.x Severity and Vector Strings:

CNA: [email protected]CVSS-B:5.3 MEDIUMVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://github.com/quickjs-ng/quickjs/blob/v0.15.1/quickjs.c#L61154	[email protected]
https://github.com/quickjs-ng/quickjs/commit/62951e1bc68711d37aad986ff84ef0fe17038a7e	[email protected]
https://github.com/quickjs-ng/quickjs/releases/tag/v0.16.0	[email protected]
https://github.com/quickjs-ng/quickjs/security/advisories/GHSA-wm7w-r6qf-3c9w	[email protected]
https://www.vulncheck.com/advisories/quickjs-ng-before-0.16.0-memory-leak-via-atomics-store	[email protected]

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-401	Missing Release of Memory after Effective Lifetime	[email protected]

Affected Products

No affected product data is available for this CVE.

Change History

2 change records found show changes

Date	Action	Recorded By
Nov 2, 2026	CVE Modified	CISA-ADP
Nov 2, 2026	New CVE Received	[email protected]