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CVE-2026-41417— Netty vulnerable to HTTP request smuggling and RTSP request injection via DefaultHttpRequest.setUri()

Quick assessment

Affected
netty netty
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Netty是Netty社区的一款非阻塞I/O客户端-服务器框架，它主要用于开发Java网络应用程序，如协议服务器和客户端等。 Netty 4.2.13.Final之前版本和4.1.133.Final之前版本存在注入漏洞，该漏洞源于setUri方法未对CRLF和空白字符进行验证，可能导致CRLF注入和HTTP请求夹带或RTSP请求注入。

CVSS 5.3 · Medium EPSS 0.34% · P25

Affected Version Matrix 2

VendorProduct Version RangeStatus
netty netty >= 4.2.0.Alpha1, <= 4.2.12.Final affected
<= 4.1.132.Final affected
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I. Basic Information for CVE-2026-41417

Vulnerability Information
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Vulnerability Title
Netty vulnerable to HTTP request smuggling and RTSP request injection via DefaultHttpRequest.setUri()
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对CRLF序列的转义处理不恰当(CRLF注入)
Source: CVE Program / CVE List V5
Vulnerability Title
Netty 注入漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Netty是Netty社区的一款非阻塞I/O客户端-服务器框架，它主要用于开发Java网络应用程序，如协议服务器和客户端等。 Netty 4.2.13.Final之前版本和4.1.133.Final之前版本存在注入漏洞，该漏洞源于setUri方法未对CRLF和空白字符进行验证，可能导致CRLF注入和HTTP请求夹带或RTSP请求注入。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
netty netty >= 4.2.0.Alpha1, <= 4.2.12.Final -

II. Public POCs for CVE-2026-41417

# POC Description Source Link Shenlong Link
AI-Generated POC Verified env Premium
Reproduced successfully in a real sandbox · Below is the actual recording of building the environment and exploiting the vulnerability.
Success marker: VULNERABLE: CRLF injection via DefaultHttpRequest.setUri() confirmed - HTTP request smuggling possible
Reproduction recording is a Pro+ exclusive
Watch the full sandbox build + live exploit recording for this CVE. Limited-time ¥499/mo.
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claude_code · 4415 chars
GitHub 复现环境（可 clone 直接跑）
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III. Intelligence Information for CVE-2026-41417

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Vendor Advisories for CVE-2026-41417 (1)

IV. Related Vulnerabilities

Same product: netty
Same vendor: netty
Same weakness: CWE-93

V. Comments for CVE-2026-41417

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