{"id":"CVE-2026-120440","title":"QuickJS-NG before 0.16.0 Memory Leak via Atomics.store","summary":"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 va…","severity":"medium","cvss":5.3,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","cvssSource":"cna","cwe":["CWE-401"],"vendor":"quickjs-ng","product":"QuickJS-NG","affected":["QuickJS-NG < 0.16.0"],"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"partial","timestamp":"2026-11-02T17:12:52.060134Z"},"published":"2026-11-02","updated":"2026-11-02","sourceUpdated":"2026-11-02T17:33:29.004Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-120440","references":[{"url":"https://github.com/quickjs-ng/quickjs/security/advisories/GHSA-wm7w-r6qf-3c9w","label":"GitHub Security Advisory (GHSA-wm7w-r6qf-3c9w)"},{"url":"https://github.com/quickjs-ng/quickjs/commit/62951e1bc68711d37aad986ff84ef0fe17038a7e"},{"url":"https://github.com/quickjs-ng/quickjs/releases/tag/v0.16.0","label":"QuickJS-NG v0.16.0 Release Notes"},{"url":"https://github.com/quickjs-ng/quickjs/blob/v0.15.1/quickjs.c#L61154"},{"url":"https://www.vulncheck.com/advisories/quickjs-ng-before-0.16.0-memory-leak-via-atomics-store","label":"VulnCheck Advisory: QuickJS-NG before 0.16.0 Memory Leak via Atomics.store"}],"tags":["cve.org"],"epss":0.00469,"epssPercentile":0.40791,"ingestedAt":"2026-11-05T19:30:42.732Z","slug":"CVE-2026-120440","body":"## Overview\n\nQuickJS-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.\n\n## Affected\n\n- `QuickJS-NG < 0.16.0`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":29,"depthScoreParts":{"impact":29.2,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}