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CVE-2026-21710

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 …

Impact

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**

Affected products

VendorProductAffected versions
NodejsNode.Js
through 20.20.1
from 22.0.0 through 22.22.1
from 24.0.0 through 24.14.0
from 25.0.0 through 25.8.1
RedhatEnterprise Linux
Versions 8.0, 9.0, 10.0
RedhatEnterprise Linux Eus
Versions 9.4, 9.6, 10.0

Weakness classification

CWE-770CWE-843

References