CVE-2026-44643: Js Unsafe Method Style Hasownproperty
Method-style `$OBJ.hasOwnProperty($KEY)` is unsafe: if `$OBJ` inherits from `Object.prototype` or its `hasOwnProperty` property has been shadowed (prototype pollution or attacker-controlled keys like `__proto__`, `constructor`), the check returns the wrong value and lets prototype properties be treated as real own keys. This is the root cause of CVE-2026-446
JSgreprules fetch cve-2026-44643-js-unsafe-method-style-hasownproperty --engine opengrepDescription
Method-style `$OBJ.hasOwnProperty($KEY)` is unsafe: if `$OBJ` inherits from `Object.prototype` or its `hasOwnProperty` property has been shadowed (prototype pollution or attacker-controlled keys like `__proto__`, `constructor`), the check returns the wrong value and lets prototype properties be treated as real own keys. This is the root cause of CVE-2026-446
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