Vulnerability DatabaseCVE-2026-120440
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CVE-2026-120440
Published:November 02, 2026
Updated:November 04, 2026
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.
Affected Packages
https://github.com/quickjs-ng/quickjs.git (GITHUB):
Affected version(s) >=v0.1.0 <v0.16.0
Fix Suggestion:
Update to version v0.16.0
Related Resources (8)
https://github.com/quickjs-ng/quickjs/releases/tag/v0.16.0
https://github.com/quickjs-ng/quickjs/security/advisories/GHSA-wm7w-r6qf-3c9w
https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/120xxx/CVE-2026-120440.json
https://www.vulncheck.com/advisories/quickjs-ng-before-0.16.0-memory-leak-via-atomics-store
https://github.com/quickjs-ng/quickjs/commit/62951e1bc68711d37aad986ff84ef0fe17038a7e
https://github.com/quickjs-ng/quickjs/blob/v0.15.1/quickjs.c#L61154
https://github.com/quickjs-ng/quickjs
https://nvd.nist.gov/vuln/detail/CVE-2026-120440
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CVSS v4
Base Score:
6.9
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
NONE
Vulnerable System Availability
LOW
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
5.3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
LOW
Weakness Type (CWE)
Missing Release of Memory after Effective Lifetime
CWE-401
EPSS
Base Score:
0.47