Description
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**
INFO
Published Date :
2026-03-30T19:07:28.558Z
Last Modified :
2026-03-31T13:55:23.719Z
Source :
hackerone
AFFECTED PRODUCTS
The following products are affected by CVE-2026-21710 vulnerability.
| Vendors | Products |
|---|---|
| Nodejs |
|
REFERENCES
Here, you will find a curated list of external links that provide in-depth information to CVE-2026-21710.
