Bug 2567545 (CVE-2026-120438)

Summary: CVE-2026-120438 quickjs-ng: quickjs-ng: Arbitrary code execution via integer overflow during proxy property enumeration
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
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Priority: high    
Version: unspecifiedKeywords: Security
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OS: Linux   
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A flaw was found in QuickJS-NG. This vulnerability allows an attacker executing JavaScript code to potentially achieve arbitrary code execution or cause a denial of service (DoS) through an application crash. The issue occurs due to an integer overflow during proxy property enumeration on 32-bit systems, which triggers a heap-based buffer overflow when an oversized array-like object is processed.
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Description OSIDB Bzimport 2026-11-05 22:06:22 UTC 
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.