Integer Overflow Vulnerability in QuickJS-NG Affects Multiple Versions
CVE-2026-120438

8.5HIGH

Key Information:

Vendor

Quickjs-ng

Status
Quickjs-ng
Vendor
CVE Published:
2 November 2026

What is CVE-2026-120438?

An integer overflow vulnerability exists in QuickJS-NG that arises from the js_proxy_get_own_property_names() function within quickjs.c. This flaw enables attackers, through running crafted JavaScript code, to generate a large array-like object from a Proxy's ownKeys trap. This manipulation can result in an allocation size that exceeds the limits, potentially leading to a heap buffer overflow on 32-bit systems. The consequences include system crashes and the possibility of executing arbitrary code, threatening overall system security.

Affected Version(s)

QuickJS-NG 0 < 0.16.0

References

https://github.com/quickjs-ng/quickjs/security/advisories...
vendor-advisory
https://github.com/quickjs-ng/quickjs/commit/252209d99cf1...
patch
https://github.com/quickjs-ng/quickjs/releases/tag/v0.16.0
release-notes

CVSS V4

Score:
8.5
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Local
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Tristan Madani (Talence Security)
Saúl Ibarra Corretgé
.