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3.7 Low

CVE-2026-58044 A flaw in Node.js HTTP client can cause a request desynchronization for Node.js-based forwarding proxies that rebuild…

Description

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 and versions

Product Affected versions Fixed in
Node 26.5.0 No fix stated
Node 24.18.0 No fix stated
Node 22.23.1 No fix stated

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