CVE-2026-41417

Netty vulnerable to HTTP request smuggling and RTSP request injection via DefaultHttpRequest.setUri()

State: Published
Severity: 5.3 Medium
Published: May 6, 2026
Updated: May 7, 2026
Reserved: Apr 20, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	5.3 Medium	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N	GitHub_M

Weaknesses

CWE-93 Improper Neutralization of CRLF Sequences ('CRLF Injection')
CWE-444 Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')

Affected Products

Product	Versions
nettynetty	>= 4.2.0.Alpha1, <= 4.2.12.FinalAffected <= 4.1.132.FinalAffected

References

https://github.com/netty/netty/security/advisories/GHSA-v8h7-rr48-vmmv

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