CVE-2026-58044: Node.js Node

Low severity, CVSS 3.7. EPSS: 0.3% chance of exploitation in the next 30 days.

A flaw in Node.js HTTP client can cause a request desynchronization for Node.js-based forwarding proxies that rebuild outbound headers from the visible `IncomingMessage` headers while piping the original body to a reused backend connection. Node.js can omit headers beyond `maxHeadersCount` / `maxHeaderPairs` from `req.headers`, `req.rawHeaders`, and `req.headersDistinct`, while still using those omitted headers internally for HTTP message framing. In particular, `Content-Length` can be hidden from userland while the request body is still delivered. This vulnerability affects all supported release lines: **Node.js 22**, **Node.js 24**, and **Node.js 26**.

Affected products

• Node.js Node: from 26, up to and including 26.5.0; from 24, up to and including 24.18.0; from 22, up to and including 22.23.1

Published 2026-08-04. Last modified 2026-09-03.