CVE-2026-42581— Netty: HTTP/1.0 TE+CL Coexistence Bypasses Smuggling Sanitization
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I. Basic Information for CVE-2026-42581
Vulnerability Information
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Vulnerability Title
Netty: HTTP/1.0 TE+CL Coexistence Bypasses Smuggling Sanitization
Source: NVD (National Vulnerability Database)
Vulnerability Description
Netty is an asynchronous, event-driven network application framework. Prior to 4.2.13.Final and 4.1.133.Final, HttpObjectDecoder strips a conflicting Content-Length header when a request carries both Transfer-Encoding: chunked and Content-Length, but only for HTTP/1.1 messages. The guard is absent for HTTP/1.0. An attacker that sends an HTTP/1.0 request with both headers causes Netty to decode the body as chunked while leaving Content-Length intact in the forwarded HttpMessage. Any downstream proxy or handler that trusts Content-Length over Transfer-Encoding will disagree on message boundaries, enabling request smuggling. This vulnerability is fixed in 4.2.13.Final and 4.1.133.Final.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
HTTP请求的解释不一致性(HTTP请求私运)
Source: NVD (National Vulnerability Database)
Vulnerability Title
Netty 环境问题漏洞
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之前版本存在环境问题漏洞，该漏洞源于HttpObjectDecoder对HTTP/1.0请求中同时存在Transfer-Encoding和Content-Length标头时未移除冲突的Content-Length，可能导致请求夹带攻击。
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
II. Public POCs for CVE-2026-42581
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- https://github.com/netty/netty/security/advisories/GHSA-xxqh-mfjm-7mv9x_refsource_CONFIRM
- https://nvd.nist.gov/vuln/detail/CVE-2026-42581
Same Patch Batch · netty · 2026-05-13 · 12 CVEs total
| CVE-2026-42587 | 7.5 HIGH | Netty: HttpContentDecompressor maxAllocation bypass via Content-Encoding: br/zstd/snappy e |
| CVE-2026-42582 | 7.5 HIGH | Netty: HTTP/3 QPACK literal unbounded allocation |
| CVE-2026-42579 | 7.5 HIGH | Netty: DNS Codec Input Validation Bypass in Netty (Encoder + Decoder) |
| CVE-2026-42583 | 7.5 HIGH | Netty: Lz4FrameDecoder resource exhaustion |
| CVE-2026-42577 | 7.5 HIGH | Netty: epoll transport denial of service via RST on half-closed TCP connection |
| CVE-2026-42584 | 7.3 HIGH | Netty: HttpClientCodec response desynchronization |
| CVE-2026-42586 | 6.8 MEDIUM | Netty: CRLF Injection in Netty Redis Codec Encoder |
| CVE-2026-42580 | 6.5 MEDIUM | Netty: HTTP Request Smuggling due to incorrect chunk size parsing |
| CVE-2026-42585 | 6.5 MEDIUM | Netty: HTTP Request Smuggling due to malformed Transfer-Encoding |
| CVE-2026-44248 | 5.3 MEDIUM | Netty: Resource exhaustion in MqttDecoder |
| CVE-2026-42578 | Netty: HTTP Header Injection via HttpProxyHandler Disabled Validation |
IV. Related Vulnerabilities
Same product: netty
- CVE-2026-44248
Netty: Resource exhaustion in MqttDecoder - CVE-2026-42587
Netty: HttpContentDecompressor maxAllocation bypass via Cont - CVE-2026-42586
Netty: CRLF Injection in Netty Redis Codec Encoder - CVE-2026-42585
Netty: HTTP Request Smuggling due to malformed Transfer-Enco - CVE-2026-42584
Netty: HttpClientCodec response desynchronization
Same vendor: netty
- CVE-2026-44248
Netty: Resource exhaustion in MqttDecoder - CVE-2026-42587
Netty: HttpContentDecompressor maxAllocation bypass via Cont - CVE-2026-42586
Netty: CRLF Injection in Netty Redis Codec Encoder - CVE-2026-42585
Netty: HTTP Request Smuggling due to malformed Transfer-Enco - CVE-2026-42584
Netty: HttpClientCodec response desynchronization
Same weakness: CWE-444
- CVE-2026-42585
Netty: HTTP Request Smuggling due to malformed Transfer-Enco - CVE-2026-42584
Netty: HttpClientCodec response desynchronization - CVE-2026-42580
Netty: HTTP Request Smuggling due to incorrect chunk size pa - CVE-2026-40562
Gazelle versions through 0.49 for Perl allows HTTP Request S - CVE-2026-40561
Starlet versions through 0.31 for Perl allows HTTP Request S
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