CVE-2026-48932
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**.
Scoring
- Severity
- LOW
- CVSS base score
- 3.7
- CVSS vector
- CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
- EPSS probability
- 0.17%
- CWE
- CWE-444
- Published
- 2026-09-01
- Last modified
- 2026-09-01
Affected products
- nodejs node
- nodejs node
- nodejs node
Weakness type
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