Is CVE-2026-120438 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-120438?

CVE-2026-120438 has a CVSS v3 severity of HIGH (7.8).

Back

CVE-2026-120438

Description

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.