CVE-2026-48932
- State
- Published
- Severity
- 3.7 Low
- Published
- Sep 1, 2026
- Updated
- Sep 1, 2026
- Reserved
- May 26, 2026
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**.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.0 | 3.7 Low | CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N | hackerone |
Weaknesses
- CWE-444 HTTP Request Smuggling
Affected Products
| Product | Versions |
|---|---|
nodenodejs |
|
References
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