Bug 2510853 (CVE-2026-58044)

Summary: CVE-2026-58044 nodejs: Node.js: Request smuggling via HTTP client header truncation
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: gtanzill, jbuscemi, kaycoth, rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in Node.js. The Node.js HTTP client can cause a request desynchronization in forwarding proxies, potentially leading to request smuggling. This vulnerability arises when the HTTP client omits certain headers, such as Content-Length, from being visible to the proxy application while still using them internally for message processing. This inconsistency can allow an attacker to bypass security controls and inject malicious requests, impacting the integrity of network communications.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description OSIDB Bzimport 2026-08-04 01:01:27 UTC 
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**.