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CVE-2026-120439— QuickJS-NG before 0.16.0 Heap Buffer Overflow via TypedArray.prototype.sort

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 在 0.16.0 版本之前存在一个整数溢出漏洞，位于 quickjs.c 文件中的 js_typed_array_sort() 函数。该漏洞允许攻击者在 32 位主机上引发堆缓冲区溢出。能够执行 JavaScript 的攻击者可以通过对包含接近 2^30 个元素的 TypedArray 调用 TypedArray.prototype.sort 并传入自定义比较器，导致分配大小发生回绕（wrap-around），从而向缓冲区之后的索引位置写入数据，造成程序崩溃，甚至可能实现代码执行。

CVSS 7.0 · High

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
quickjs-ng QuickJS-NG < 0.16.0 affected
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I. Basic Information for CVE-2026-120439

Vulnerability Information
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Vulnerability Title
QuickJS-NG before 0.16.0 Heap Buffer Overflow via TypedArray.prototype.sort
Source: CVE Program / CVE List V5
Vulnerability Description
QuickJS-NG before 0.16.0 contains an integer overflow in js_typed_array_sort() in quickjs.c that allows attackers to cause a heap buffer overflow on 32-bit hosts. Attackers who can run JavaScript can call TypedArray.prototype.sort with a comparator on a typed array near 2^30 elements, wrapping the allocation size and writing indices past the buffer to crash or potentially execute code.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
整数溢出或超界折返
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-2026-120439

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-120439

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Other References for CVE-2026-120439 (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-2026-120440 5.3 MEDIUM QuickJS-NG before 0.16.0 Memory Leak via Atomics.store

IV. Related Vulnerabilities

Same product: QuickJS-NG
Same vendor: quickjs-ng
Same weakness: CWE-190