CVE-2026-58044

State: Published
Severity: 3.7 Low
Published: Aug 4, 2026
Updated: Aug 4, 2026
Reserved: Jun 27, 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	26.5.0 through 26.5.0Affected 24.18.0 through 24.18.0Affected 22.23.1 through 22.23.1Affected

References

https://nodejs.org/en/blog/vulnerability/july-2026-security-releases

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