Netty allows request-line validation to be bypassed when a `DefaultHttpRequest` or `DefaultFullHttpRequest` is created first and its URI is later changed via `setUri()`. The constructors reject CRLF and whitespace characters that would break the start-line, but `setUri()` does not apply the same validation. `HttpRequestEncoder` and `RtspEncoder` then write the URI into the request line verbatim. If attacker-controlled input reaches `setUri()`, this enables CRLF injection and insertion of additional HTTP or RTSP requests, leading to HTTP request smuggling or desynchronization on the HTTP side and request injection on the RTSP side. This issue is fixed in versions 4.2.13.Final and 4.1.133.Final.

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Advisories
Source ID Title
Github GHSA Github GHSA GHSA-v8h7-rr48-vmmv Netty: Start-Line Injection in DefaultHttpRequest.setUri() Allows HTTP Request Smuggling and RTSP Request Injection
Fixes

Solution

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Workaround

No workaround given by the vendor.

History

Wed, 06 May 2026 21:30:00 +0000

Type Values Removed Values Added
Description Netty allows request-line validation to be bypassed when a `DefaultHttpRequest` or `DefaultFullHttpRequest` is created first and its URI is later changed via `setUri()`. The constructors reject CRLF and whitespace characters that would break the start-line, but `setUri()` does not apply the same validation. `HttpRequestEncoder` and `RtspEncoder` then write the URI into the request line verbatim. If attacker-controlled input reaches `setUri()`, this enables CRLF injection and insertion of additional HTTP or RTSP requests, leading to HTTP request smuggling or desynchronization on the HTTP side and request injection on the RTSP side. This issue is fixed in versions 4.2.13.Final and 4.1.133.Final.
Title Netty vulnerable to HTTP request smuggling and RTSP request injection via DefaultHttpRequest.setUri()
Weaknesses CWE-444
CWE-93
References
Metrics cvssV3_1

{'score': 5.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-05-06T20:52:47.206Z

Reserved: 2026-04-20T15:32:33.813Z

Link: CVE-2026-41417

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-05-06T22:16:25.780

Modified: 2026-05-06T22:16:25.780

Link: CVE-2026-41417

cve-icon Redhat

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cve-icon OpenCVE Enrichment

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Weaknesses