CVE-2026-120440

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    CVE-2026-120440

    Published: 2 Nov 2026Last Modified: 4 Nov 2026

    Summary: QuickJS-NG before 0.16.0 Memory Leak via Atomics.store

    Details: 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.

    References: https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/120xxx/CVE-2026-120440.json, https://github.com/quickjs-ng/quickjs/releases/tag/v0.16.0, https://github.com/quickjs-ng/quickjs/security/advisories/GHSA-wm7w-r6qf-3c9w, https://nvd.nist.gov/vuln/detail/CVE-2026-120440, 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, https://github.com/quickjs-ng/quickjs/blob/v0.15.1/quickjs.c#L61154

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -10b99693cdc3f37cdf05114bc2d5225de495c4a3

    Affected versions

    v0.15.1
    v0.15.0

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    CVE-2026-120440 | CVE-DB