CVE-2026-120438highCWE-190

CVE-2026-120438: high-severity vulnerability in QuickJS-NG

QuickJS-NG before 0.16.0 Heap Buffer Overflow via Proxy ownKeys Enumeration

Published

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18Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackcvss 8.5
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.
CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Affected products
quickjs-ng · QuickJS-NG
Related CVEs — QuickJS-NG

In the same product, most dangerous first.

CVE-2026-120440MEDIUMQuickJS-NG before 0.16.0 Memory Leak via Atomics.storeEPSS —CVE-2026-120439HIGHQuickJS-NG before 0.16.0 Heap Buffer Overflow via TypedArray.prototype.sortEPSS —