Request injection via unvalidated setUri mutation
Published May 6, 2026 · Updated May 6, 2026
CRLF injection in Netty 4.1.132.Final and earlier and 4.2.0.Alpha1 through 4.2.12.Final allows remote attackers to inject HTTP or RTSP requests. DefaultHttpRequest.setUri performs only a null check, and the HTTP and RTSP encoders serialize its attacker-controlled URI into the request line without validation. Exploitation requires a consuming application to mutate a previously constructed request with attacker-influenced input, enabling additional downstream requests and HTTP desynchronization.
Summary
What happened
CRLF injection in Netty 4.1.132.Final and earlier and 4.2.0.Alpha1 through 4.2.12.Final allows remote attackers to inject HTTP or RTSP requests. DefaultHttpRequest.setUri performs only a null check, and the HTTP and RTSP encoders serialize its attacker-controlled URI into the request line without validation. Exploitation requires a consuming application to mutate a previously constructed request with attacker-influenced input, enabling additional downstream requests and HTTP desynchronization.
The record
- CVE
- CVE-2026-41417
- Published
- May 6, 2026
- Updated
- May 6, 2026
- Vendor
- The Netty Project
- Product
- Netty
- Classifications
- CWE-444, CWE-93, T1190
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- May 6, 2026CVE publishedPublication date reported by the CVE source.
- May 6, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=<= 4.1.132.Final
- Affected versionversion=>= 4.2.0.Alpha1, <= 4.2.12.Final
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- DefaultHttpRequest.setUri HTTP and RTSP proof of conceptproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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