CVE-2026-120438: QuickJS-NG before 0.16.0 contains an integer overflow in js_proxy_get_own_property_names() in quickjs.c that c

Routine

HIGH 7.8

CVE-2026-120438 is a high-severity flaw (CVSS 7.8) affecting affected software. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

High severity

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	7.8 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	n/a
CISA exploited list	No
Weakness	CWE-190
Published	2026-11-02
Last modified	2026-11-02

Publisher (CNA): VulnCheck

Last updated 2026-11-02 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Timeline

2026-11-02 15:17 UTCPublished CVE record published
2026-11-02 15:17 UTCUpdated Record last modified

Advisories and coverage

Research and news

VulDB Recent Entries: CVE-2026-120438 | QuickJS-NG up to 0.15.x Proxy quickjs.c js_proxy_get_own_property_names integer overflow 2026-11-02

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-120438?

No fixed release is listed yet. Watch the vendor advisory and apply any mitigation shown on this page.

Is CVE-2026-120438 being exploited?

CVE-2026-120438 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-120438 affect?

CVE-2026-120438 affects affected software. Severity is high (CVSS 7.8). 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 ownKe

How urgent is CVE-2026-120438?

Priority 27/100. High severity

References

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