CVE-2026-120440
QuickJS-NG before 0.16.0 Memory Leak via Atomics.store
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.
Fixes and workarounds
No remediation reported in collected sources.
Missing remediation information is not evidence that no patch exists.
Affected products and versions
| Product | Versions | Authority |
|---|---|---|
| QuickJS-NG quickjs-ng quickjs-ng/quickjs
github |
≥ 0; < 0.16.0 (affected, semver)
Other versions: unaffected |
CNA: VulnCheck |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
| Version / score | Vector | Authority |
|---|---|---|
| 4.0 / 6.9 medium |
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 | CNA: VulnCheck |
| 3.1 / 5.3 medium |
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L | CNA: VulnCheck |
Exploit evidence
No exploit evidence in collected sources. This is not proof of no exploitation.
References
- https://github.com/quickjs-ng/quickjs/security/advisories/GHSA-wm7w-r6qf-3c9wCNA: VulnCheck · vendor-advisory
- https://github.com/quickjs-ng/quickjs/commit/62951e1bc68711d37aad986ff84ef0fe17038a7eCNA: VulnCheck · patch
- https://github.com/quickjs-ng/quickjs/releases/tag/v0.16.0CNA: VulnCheck · release-notes
- https://github.com/quickjs-ng/quickjs/blob/v0.15.1/quickjs.c#L61154CNA: VulnCheck · technical-description
- https://www.vulncheck.com/advisories/quickjs-ng-before-0.16.0-memory-leak-via-atomics-storeCNA: VulnCheck · third-party-advisory
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