{"id":"CVE-2026-120440","aliases":["DEBIAN-CVE-2026-120440","EUVD-2026-115200","GHSA-48fx-7fjq-qgg4","GHSA-wm7w-r6qf-3c9w","UBUNTU-CVE-2026-120440"],"status":"published","title":"QuickJS-NG before 0.16.0 Memory Leak via Atomics.store","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.","severity":{"version":"4.0","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","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.00469,"percentile":0.41047,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-401"],"published":"2026-11-02T14:29:02Z","modified":"2026-11-06T12:02:20Z","fixes":[{"ecosystem":"Debian:14","package":"quickjs-ng","fixed_in":["0.16.2-1"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Debian:14","package":"quickjs-ng","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.16.2-1"}]}],"versions":["0.13.0-1","0.13.0-2","0.13.0-3","0.14.0-1","0.14.0-2","0.14.0-2~bpo13+1","0.14.0-2~bpo13+2","0.15.0-1","0.15.0-1~bpo13+1","0.15.1-1","0.15.1-1~bpo13+1"]},{"source":"osv","ecosystem":"Ubuntu:26.10","package":"quickjs-ng","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.15.0-1","0.15.1-1","0.16.2-2"]}],"products":[{"vendor":"quickjs-ng","product":"quickjs-ng"}],"references":[{"url":"https://github.com/quickjs-ng/quickjs/security/advisories/GHSA-wm7w-r6qf-3c9w","tags":["vendor-advisory","advisory","report"]},{"url":"https://github.com/quickjs-ng/quickjs/commit/62951e1bc68711d37aad986ff84ef0fe17038a7e","tags":["patch","fix","report"]},{"url":"https://github.com/quickjs-ng/quickjs/releases/tag/v0.16.0","tags":["release-notes","advisory","report"]},{"url":"https://github.com/quickjs-ng/quickjs/blob/v0.15.1/quickjs.c#L61154","tags":["technical-description","article","report"]},{"url":"https://www.vulncheck.com/advisories/quickjs-ng-before-0.16.0-memory-leak-via-atomics-store","tags":["third-party-advisory","advisory","report"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-120440","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-48fx-7fjq-qgg4"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/120xxx/CVE-2026-120440.json","tags":["advisory"]},{"url":"https://github.com/quickjs-ng/quickjs","tags":["package"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-120440","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2026-120440","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-120440","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2026-120440","title":"QuickJS-NG before 0.16.0 Memory Leak via Atomics.store","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.","status":"published","published":"2026-11-02T14:29:02.038Z","modified":"2026-11-02T17:33:29.004Z","cvss":[{"version":"4.0","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","level":"medium","assessor":"cna"},{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium","assessor":"cna"}],"cwes":["CWE-401"],"updated_at":"2026-11-02T19:02:29.283836Z"}],"euvd":[{"id":"EUVD-2026-115200","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.","status":"published","published":"2026-11-02T14:29:02Z","modified":"2026-11-02T17:33:29Z","cvss":[{"version":"4.0","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","level":"medium"}],"updated_at":"2026-11-03T05:08:39.764975Z"}],"ghsa":[{"id":"GHSA-48fx-7fjq-qgg4","title":"QuickJS-NG before 0.16.0 contains a memory leak vulnerability in js_atomics_store() in quickjs.c...","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.","status":"published","published":"2026-11-02T15:31:41Z","modified":"2026-11-02T15:31:41Z","cvss":[{"version":"4.0","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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"medium"},{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium"}],"cwes":["CWE-401"],"updated_at":"2026-11-02T18:00:16.184668Z"}],"nvd":[{"id":"CVE-2026-120440","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.","status":"published","published":"2026-11-02T15:17:26.103Z","modified":"2026-11-02T19:34:23.993Z","cvss":[{"version":"4.0","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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"medium","assessor":"secondary"},{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium","assessor":"secondary"}],"cwes":["CWE-401"],"updated_at":"2026-11-03T00:02:42.67885Z"}],"osv":[{"id":"CVE-2026-120440","title":"QuickJS-NG before 0.16.0 Memory Leak via Atomics.store","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.","status":"published","published":"2026-11-02T14:29:02.038Z","modified":"2026-11-04T07:08:05.958885386Z","cvss":[{"version":"4.0","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","level":"medium"}],"cwes":["CWE-401"],"updated_at":"2026-11-04T07:32:23.735279Z"},{"id":"DEBIAN-CVE-2026-120440","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.","status":"published","published":"2026-11-02T15:17:26.103Z","modified":"2026-11-06T12:02:20.665296929Z","cvss":[{"version":"4.0","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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"medium"}],"updated_at":"2026-11-06T12:12:56.168821Z"},{"id":"UBUNTU-CVE-2026-120440","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.","status":"published","published":"2026-11-02T15:17:00Z","modified":"2026-11-05T04:42:52Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium"},{"version":"4.0","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","level":"medium"}],"updated_at":"2026-11-05T13:33:25.727744Z"}]}}