CVE-2026-42578— Netty: HTTP Header Injection via HttpProxyHandler Disabled Validation
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I. Basic Information for CVE-2026-42578
Vulnerability Information
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Vulnerability Title
Netty: HTTP Header Injection via HttpProxyHandler Disabled Validation
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, Netty's HttpProxyHandler constructs HTTP CONNECT requests with header validation explicitly disabled. The newInitialMessage() method creates headers using DefaultHttpHeadersFactory.headersFactory().withValidation(false), then adds user-provided outboundHeaders without any CRLF validation. This allows an attacker who can influence the outbound headers to inject arbitrary HTTP headers into the CONNECT request sent to the proxy server. This vulnerability is fixed in 4.2.13.Final and 4.1.133.Final.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
HTTP头部中CRLF序列转义处理不恰当(HTTP响应分割)
Source: NVD (National Vulnerability Database)
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HttpProxyHandler构建HTTP CONNECT请求时禁用标头验证，可能导致CRLF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
II. Public POCs for CVE-2026-42578
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- https://github.com/netty/netty/security/advisories/GHSA-45q3-82m4-75jrx_refsource_CONFIRM
- https://nvd.nist.gov/vuln/detail/CVE-2026-42578
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-2026-42581 | 5.8 MEDIUM | Netty: HTTP/1.0 TE+CL Coexistence Bypasses Smuggling Sanitization |
| CVE-2026-44248 | 5.3 MEDIUM | Netty: Resource exhaustion in MqttDecoder |
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-113
- CVE-2026-7010
HTTP::Tiny versions before 0.093 for Perl do not validate CR - CVE-2026-42874
Microdot: HTTP response splitting in Response.set_cookie() - CVE-2026-42035
Axios: Header Injection via Prototype Pollution - CVE-2026-39971
Serendipity: Host Header Injection leads to SMTP header inje - CVE-2026-40175
Axios has Unrestricted Cloud Metadata Exfiltration via Heade
V. Comments for CVE-2026-42578
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