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.

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact Low

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact Low

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Exploitation none

Automatable yes

Technical Impact partial

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
quickjs-ng QuickJS-NG unaffected
Version Status Constraints
0 affected < 0.16.0

No data.

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Project Subscriptions

Vendors Products
Quickjs Project Subscribe
Quickjs Subscribe
Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

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

Mon, 02 Nov 2026 18:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Mon, 02 Nov 2026 14:30:00 +0000

Type Values Removed Values Added
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.
Title QuickJS-NG before 0.16.0 Memory Leak via Atomics.store
First Time appeared Quickjs Project
Quickjs Project quickjs
Weaknesses CWE-401
CPEs cpe:2.3:a:quickjs_project:quickjs:*:*:*:*:*:*:*:*
Vendors & Products Quickjs Project
Quickjs Project quickjs
References
Metrics cvssV3_1

{'score': 5.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L'}

cvssV4_0

{'score': 6.9, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-11-02T17:33:29.004Z

Reserved: 2026-11-02T12:42:15.887Z

Link: CVE-2026-120440

cve-icon Vulnrichment

Updated: 2026-11-02T17:12:52.775Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-11-02T15:17:26.103

Modified: 2026-11-02T19:34:23.993

Link: CVE-2026-120440

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-11-02T15:30:14Z

Weaknesses