CVE-2026-48932: 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 22, up to and including 22.22.3; from 24, up to and including 24.16.0; from 26, up to and including 26.3.0

Published 2026-09-01. Last modified 2026-09-03.