CVE-2026-58044
Published:August 04, 2026
Updated:August 04, 2026
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 Packages
https://github.com/nodejs/node.git (GITHUB):
Affected version(s) >=v26.0.0 <v26.5.1Fix Suggestion:
Update to version v26.5.1https://github.com/nodejs/node.git (GITHUB):
Affected version(s) >=v22.0.0 <v22.23.2Fix Suggestion:
Update to version v22.23.2https://github.com/nodejs/node.git (GITHUB):
Affected version(s) >=v24.0.0 <v24.18.1Fix Suggestion:
Update to version v24.18.1Additional Notes
The description of this vulnerability differs from MITRE.
Related Resources (1)
Do you need more information?
Contact UsCVSS v4
Base Score:
6.3
Attack Vector
NETWORK
Attack Complexity
HIGH
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
LOW
Vulnerable System Availability
NONE
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
3.7
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
LOW
Availability
NONE
Weakness Type (CWE)
Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
EPSS
Base Score:
0.28