---
id: CVE-2026-120439
title: QuickJS-NG before 0.16.0 Heap Buffer Overflow via TypedArray.prototype.sort
summary: >-
  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…
severity: high
cvss: 7
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:H'
cvssSource: cna
cwe:
  - CWE-190
vendor: quickjs-ng
product: QuickJS-NG
affected:
  - QuickJS-NG < 0.16.0
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-11-06T19:30:12.358583Z'
exploitAvailable: true
published: '2026-11-02'
updated: '2026-11-06'
sourceUpdated: '2026-11-06T19:30:29.306Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-120439'
references:
  - url: >-
      https://github.com/quickjs-ng/quickjs/security/advisories/GHSA-9wv5-5cgr-grj6
    label: GitHub Security Advisory (GHSA-9wv5-5cgr-grj6)
  - url: >-
      https://github.com/quickjs-ng/quickjs/commit/e93cca611908e12b824ec85fbee6b31a5ee61568
  - url: 'https://github.com/quickjs-ng/quickjs/releases/tag/v0.16.0'
    label: QuickJS-NG v0.16.0 Release Notes
  - url: 'https://github.com/quickjs-ng/quickjs/blob/v0.15.1/quickjs.c#L60032'
  - url: >-
      https://www.vulncheck.com/advisories/quickjs-ng-before-0.16.0-heap-buffer-overflow-via-typedarray-prototype-sort
    label: >-
      VulnCheck Advisory: QuickJS-NG before 0.16.0 Heap Buffer Overflow via
      TypedArray.prototype.sort
tags:
  - cve.org
  - exploit-available
epss: 0.00343
epssPercentile: 0.28017
ingestedAt: '2026-11-05T19:30:42.654Z'
---

## Overview

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.

## Affected

- `QuickJS-NG < 0.16.0`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.