CVE-2026-120438

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.

Overview

State: PUBLISHED
Assigner (CNA): VulnCheck
CVSS severity: HIGH
CVSS score: 8.5 / 10
CVSS vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Effective score: 8.5 / 10 HIGH source: CNA overview
CWE(s): CWE-190
Reserved: 2026-11-02
Published: 2026-11-02 14:29 UTC
Last updated: 2026-11-02 14:29 UTC
Source: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/120xxx/CVE-2026-120438.json
Linked Threat: CVE-2026-120438 — QuickJS-NG before 0.16.0 Heap Buffer Overflow via Proxy ownKeys Enumeration

NVD triage scoring NVD CVE 2.0

Layer NVD adds on top of the CNA's CVE record — published / last-modified timestamps, exploitability / impact subscores, and the FIRST.org EPSS probability that this CVE will be exploited in the wild in the next 30 days.

NVD published: 2026-11-02 15:17:25 UTC
NVD last modified: 2026-11-02 19:34:23 UTC
NVD CVSS v3.1: 7.8 / 10 HIGH source: disclosure@vulncheck.com
NVD CVSS vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Exploitability subscore: 1.8 / 10
Impact subscore: 5.9 / 10

European Union Vulnerability Database ENISA EUVD

ENISA's official EU repository for curated vulnerability intelligence. Carries a separate identifier (EUVD-YYYY-NNNN) and frequently exposes an earlier-published description + CVSS than NVD does.

EUVD ID: EUVD-2026-115198
Assigner: VulnCheck
Published: Nov 2, 2026, 2:29:00 PM
Updated: Nov 2, 2026, 2:29:00 PM
EUVD base score (CVSS 4.0): 8.5 / 10
CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
EUVD-reported EPSS: 0.0000
Vendors: quickjs-ng
Products: QuickJS-NG (0 <0.16.0)
Aliases: GHSA-m9xj-cppc-fm6c

ENISA 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.

EUVD references (5)

Affected products (1)

Vendor	Product	Versions	Platforms
quickjs-ng	QuickJS-NG	`0` (affected)	—

Vendor references (5)

References embedded in the original CVE record by the assigning CNA.

GitHub Security Advisory (GHSA-jp52-chwg-2p9p) vendor-advisory
https://github.com/quickjs-ng/quickjs/commit/252209d99cf112568160548bdcaa98d95e0d0068 patch
QuickJS-NG v0.16.0 Release Notes release-notes
https://github.com/quickjs-ng/quickjs/blob/v0.15.1/quickjs.c#L51509 technical-description
VulnCheck Advisory: QuickJS-NG before 0.16.0 Heap Buffer Overflow via Proxy ownKeys Enumeration third-party-advisory

MITRE references (5) cveawg.mitre.org

Pulled from MITRE's CVE Services API by the 🛰 Backfill from MITRE button.

https://github.com/quickjs-ng/quickjs/blob/v0.15.1/quickjs.c#L51509 technical-description
https://github.com/quickjs-ng/quickjs/commit/252209d99cf112568160548bdcaa98d95e0d0068 patch
QuickJS-NG v0.16.0 Release Notes release-notes
GitHub Security Advisory (GHSA-jp52-chwg-2p9p) vendor-advisory
VulnCheck Advisory: QuickJS-NG before 0.16.0 Heap Buffer Overflow via Proxy ownKeys Enumeration third-party-advisory

Web references (0)

DuckDuckGo results ranked by threat-intel / vendor advisory domains. Generated by the 🔎 Find references (web) button above — same flow as the Remediations search.

No web references attached yet.

NVD-tagged references (5)

Reference list NVD curates from the CNA record, vendor advisories, and third-party reports. The tag chips below are NVD's analyst-assigned categories.

https://github.com/quickjs-ng/quickjs/blob/v0.15.1/quickjs.c#L51509 disclosure@vulncheck.com
https://github.com/quickjs-ng/quickjs/commit/252209d99cf112568160548bdcaa98d95e0d0068 disclosure@vulncheck.com
https://github.com/quickjs-ng/quickjs/releases/tag/v0.16.0 disclosure@vulncheck.com
https://github.com/quickjs-ng/quickjs/security/advisories/GHSA-jp52-chwg-2p9p disclosure@vulncheck.com
https://www.vulncheck.com/advisories/quickjs-ng-before-0.16.0-heap-buffer-overflow-via-proxy-ownkeys-enumeration disclosure@vulncheck.com

Remediations (10)

Remediations are stored against the linked Threat row; the list below is deduplicated across both pages.

CVE Database Search & Remediation Guidance

web:cvedatabase.com

Search and analyze CVE vulnerabilities with instant access to CVSS scores, affected products, and remediation guidance.

2026-11-03 08:20 UTC
CVE Vulnerabilities 2026: Critical Flaws & Fixes Hub

web:cyberupdates365.com

Track critical CVE vulnerabilities 2026 with verified enterprise patch guides. Fix zero-days across VMware, WordPress, Windows, and cloud infrastructure.

2026-11-03 08:20 UTC
NVD - Search

web:nvd.nist.gov

Search Please make use of the interactive search interfaces to find information in the database!

2026-11-03 08:20 UTC
2026 Catalog Release History - Patch My PC

web:patchmypc.com

You can find the production release history below for 2026 . View the 2025 Catalog Release History.

2026-11-03 08:20 UTC
What Is CVE Remediation in 2026? - aikido.dev

web:www.aikido.dev

None of these is a clean fix , which is why the decision on how to remediate depends on knowing what package versions are running in production and why. This post will cover how AI has accelerated CVE detection and discovery, the upgrade trap, what CVE remediation actually involves in 2026 , and how to solve the CVE remediation problem.

2026-11-03 08:20 UTC
CVE: Common Vulnerabilities and Exposures

web:www.cve.org

At cve .org, we provide the authoritative reference method for publicly known information-security vulnerabilities and exposures

2026-11-03 08:20 UTC
National Vulnerability Database | NIST

web:www.nist.gov

NIST maintains the National Vulnerability Database (NVD), a repository of information on software and hardware flaws that can compromise computer security. This is a key piece of the nation's cybersecurity infrastructure.

2026-11-03 08:20 UTC
Oracle Critical Patch Update Advisory - July 2026

web:www.oracle.com

This Critical Patch Update contains 1448 new security patches across the product families listed below. Please note that a My Oracle Support (MOS) note summarizing the content of this Critical Patch Update and other Oracle Software Security Assurance activities is located at July 2026 Critical Patch Update: Executive Summary and Analysis.

2026-11-03 08:20 UTC
Oracle Critical Security Patch Update Advisory - September 2026

web:www.oracle.com

Prior Critical Patch Update and Critical Security Patch Update advisories should be reviewed for information regarding earlier published security patches. Refer to Critical Patch Updates, Critical Security Patch Updates, Security Alerts and Bulletins for information about Oracle Security advisories.

2026-11-03 08:20 UTC
The CVE Database: Curated Vulnerability Intelligence by Wiz | Wiz

web:www.wiz.io

Wiz's CVE Database curates CVE data to create easy-to-navigate profiles that cover the entire vulnerability timeline, exploit scenarios, and mitigation steps.

2026-11-03 08:20 UTC

AI Forensic Analysis

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Raw JSON

The full cvelistV5 record. Download as CVE-2026-120438.json.

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          "type": "remediation developer",
          "value": "Sa\u00fal Ibarra Corretg\u00e9"
        }
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