Vulnerability details

CVE-2026-120439

quickjs-ng QuickJS-NG

QuickJS-NG before 0.16.0 Heap Buffer Overflow via TypedArray.prototype.sort

CVSS 4.0

8.3High

Official 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.

CVSS scores

Score	Version	Source	Vector
8.3High	4.0	CVEProject cvelistV5 (CNA) (VulnCheck)	`CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N`
7.0High	3.1	CVEProject cvelistV5 (CNA) (VulnCheck)	`CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:H`

Affected products

Vendor	Product	Versions	Source
quickjs-ng	QuickJS-NG	v < 0.16.0	CVEProject cvelistV5 (CNA)

References and advisories

https://github.com/quickjs-ng/quickjs/commit/e93cca611908e12b824ec85fbee6b31a5ee61568 patch
https://github.com/quickjs-ng/quickjs/releases/tag/v0.16.0 release-notes
https://github.com/quickjs-ng/quickjs/blob/v0.15.1/quickjs.c#L60032 technical-description
https://www.vulncheck.com/advisories/quickjs-ng-before-0.16.0-heap-buffer-overflow-via-typedarray-prototype-sort third-party-advisory
https://github.com/quickjs-ng/quickjs/security/advisories/GHSA-9wv5-5cgr-grj6 vendor-advisory

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Details

Published: 2026-11-02
Last updated: 2026-11-06
State: Published
Assigner (CNA): VulnCheck

Exploit prediction (EPSS)

0.34%

Probability of exploitation in 30 days

28%

Percentile (among all CVEs)

SSVC assessment (CISA)

Automatable: No
Exploitation: Proof of concept
Technical impact: Partial

Weaknesses (CWE)

CWE-190
Integer Overflow or Wraparound