| Package | Affected versions | Patched versions |
|---|---|---|
| node.js | ≥ 22.0.0, ≤ 22.22.1≥ 24.0.0, ≤ 24.14.0≥ 25.0.0, ≤ 25.8.1≤ 20.20.1 |
A flaw in Node.js HTTP request handling causes an uncaught `TypeError` when a request is received with a header named `__proto__` and the application accesses `req.headersDistinct`. When this occurs, `dest["__proto__"]` resolves to `Object.prototype` rather than `undefined`, causing `.push()` to be called on a non-array. This exception is thrown synchronously inside a property getter and cannot be intercepted by `error` event listeners, meaning it cannot be handled without wrapping every `req.headersDistinct` access in a `try/catch`. * This vulnerability affects all Node.js HTTP servers on **20.x, 22.x, 24.x, and v25.x**
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