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CVE-2026-120440— QuickJS-NG before 0.16.0 Memory Leak via Atomics.store

Quick assessment

Affected
quickjs-ng QuickJS-NG
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

QuickJS-NG 0.16.0 之前的版本在 quickjs.c 文件的 js_atomics_store() 函数中存在内存泄漏漏洞：当函数返回 RangeError 时，未能释放已转换的值。攻击者可通过 JavaScript 反复调用 Atomics.store，并传入一个会分离或缩小缓冲区的 valueOf 值，从而耗尽堆内存，导致拒绝服务（DoS）。

CVSS 5.3 · Medium

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 1

VendorProduct Version RangeStatus
quickjs-ng QuickJS-NG < 0.16.0 affected
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I. Basic Information for CVE-2026-120440

Vulnerability Information
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Vulnerability Title
QuickJS-NG before 0.16.0 Memory Leak via Atomics.store
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
在移除最后引用时对内存的释放不恰当(内存泄露)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
quickjs-ng QuickJS-NG 0 ~ 0.16.0 -

II. Public POCs for CVE-2026-120440

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-120440

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Other References for CVE-2026-120440 (5)

Same Patch Batch · quickjs-ng · 2026-11-02 · 3 CVEs total

CVE-2026-120438 7.8 HIGH QuickJS-NG before 0.16.0 Heap Buffer Overflow via Proxy ownKeys Enumeration
CVE-2026-120439 7.0 HIGH QuickJS-NG before 0.16.0 Heap Buffer Overflow via TypedArray.prototype.sort

IV. Related Vulnerabilities

Same product: QuickJS-NG
Same vendor: quickjs-ng
Same weakness: CWE-401