CRLF injection in Netty - CVE-2026-41417
Published: May 5, 2026
Vulnerability identifier: #VU130216
CSH Severity: Medium
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-41417
CWE-ID: CWE-93
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerable software:
Netty
Netty
Software vendor:
Netty project
Netty project
Description
The vulnerability allows a remote attacker to inject additional HTTP or RTSP requests.
The vulnerability exists due to improper neutralization of CRLF sequences in DefaultHttpRequest.setUri() and DefaultFullHttpRequest.setUri() when encoding attacker-controlled URIs into request lines through HttpRequestEncoder or RtspEncoder. A remote attacker can supply a specially crafted URI containing CRLF sequences to inject additional HTTP or RTSP requests.
Exploitation requires an application to create the request object first, later modify it through setUri(), and then serialize it with HttpRequestEncoder or RtspEncoder.
Remediation
Install security update from vendor's website.