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CVE-2026-120439

7, high

QuickJS-NG Integer Overflow Vulnerability

NVD (opens in a new tab) CVE.org (opens in a new tab)
CVSS
7, high high CVSS v3.1
EPSS, next 30 days
n/a
Exploitation
No public evidence
Published
2 Nov 2026yesterday

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.

Details

Vendor
Quickjs-ng
Product
QuickJS-NG
Weakness
CWE-190 (opens in a new tab)
Status
Awaiting analysis
Updated
2 Nov 2026
Assigner
disclosure@vulncheck.com

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:H

References 5

Patches and fixes 1

Advisories 1

Other references 3

The kind is read from NVD's tags where present and from the shape of the URL otherwise, so treat it as a hint.

Other Quickjs-ng CVEs

Every Quickjs-ng CVE we hold

Same vendor in what we hold, not a known link between the flaws.

Beyond this page

Is CVE-2026-120439 in your network?

This page tells you how dangerous CVE-2026-120439 is out there. Whether it sits on one of your devices, only a scan of your own network can tell. That is what our systems do, every day, for the companies we protect.

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  • EXYS7950 KONDRA

    Detect it if it's exploited

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Check your exposure

Assembled from the NVD 2.0 API, the CISA Known Exploited Vulnerabilities Catalog and FIRST EPSS. Scores are as of our last collection on 3 Nov 2026, not the live upstream state.