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CVE-2026-120438— QuickJS-NG before 0.16.0 Heap Buffer Overflow via Proxy ownKeys Enumeration

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 之前的版本中，其 quickjs.c 文件中的 js_proxy_get_own_property_names() 函数存在整数溢出漏洞。在 32 位主机上，该漏洞会导致堆缓冲区溢出。攻击者可通过执行 JavaScript，利用 Proxy 的 ownKeys 陷阱返回一个大型类数组对象，从而绕过分配大小限制，引发系统崩溃或潜在代码执行。

CVSS 7.8 · High EPSS 0.14% · P3 Updated Nov 02, 2026

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

Vendor	Product	Version Range	Status
quickjs-ng	QuickJS-NG	`< 0.16.0`	affected

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Vulnerability Information

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Vulnerability Title

QuickJS-NG before 0.16.0 Heap Buffer Overflow via Proxy ownKeys Enumeration

Source: CVE Program / CVE List V5

Vulnerability Description

QuickJS-NG before 0.16.0 contains an integer overflow in js_proxy_get_own_property_names() in quickjs.c that causes a heap buffer overflow on 32-bit hosts. Attackers running JavaScript can return a large array-like object from a Proxy ownKeys trap to wrap the allocation size, causing crashes or potential code execution.

Source: CVE Program / CVE List V5

CVSS Information

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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-2026-120438

#	POC Description	Source Link	Shenlong Link

AI-Generated POC Premium

No public POC found.

III. Intelligence Information for CVE-2026-120438

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Other References for CVE-2026-120438 (5)

https://github.com/quickjs-ng/quickjs/commit/252209d99cf112568160548bdcaa98d95e0d0068 patch
https://github.com/quickjs-ng/quickjs/blob/v0.15.1/quickjs.c#L51509 technical-description
https://github.com/quickjs-ng/quickjs/releases/tag/v0.16.0 release-notes
https://github.com/quickjs-ng/quickjs/security/advisories/GHSA-jp52-chwg-2p9p vendor-advisory
https://www.vulncheck.com/advisories/quickjs-ng-before-0.16.0-heap-buffer-overflow-via-proxy-ownkeys-enumeration third-party-advisory

https://www.cve.org/CVERecord?id=CVE-2026-120438

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

CVE-2026-120439	7.0 HIGH	QuickJS-NG before 0.16.0 Heap Buffer Overflow via TypedArray.prototype.sort
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