CVE-2026-59724: Engine Unsafe Prototype Lookup Dos
Object property lookup using an unvalidated key allows built-in prototype properties (e.g., `__proto__`) to bypass simple truthiness checks. If the resolved inherited object is used improperly, this can lead to unhandled exceptions and Denial of Service (DoS). Validate that the property exists directly on the object using `Object.hasOwn()`, `.hasOwnProperty.
JSgreprules fetch cve-2026-59724-engine-unsafe-prototype-lookup-dos --engine opengrepDescription
Object property lookup using an unvalidated key allows built-in prototype properties (e.g., `__proto__`) to bypass simple truthiness checks. If the resolved inherited object is used improperly, this can lead to unhandled exceptions and Denial of Service (DoS). Validate that the property exists directly on the object using `Object.hasOwn()`, `.hasOwnProperty.
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