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CVE-2026-42585— Netty: HTTP Request Smuggling due to malformed Transfer-Encoding

Quick assessment

Affected
netty netty
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
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和4.1.133.Final之前版本存在环境问题漏洞，该漏洞源于错误解析格式错误的Transfer-Encoding，可能导致请求夹带攻击。

CVSS 6.5 · Medium EPSS 0.29% · P20

Affected Version Matrix 4

VendorProduct Version RangeStatus
io.netty netty-codec-http >= 4.2.0.Alpha1, < 4.2.13.Final affected
< 4.1.133.Final affected
netty netty >= 4.2.0.Alpha1, < 4.2.13.Final affected
< 4.1.133.Final affected
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I. Basic Information for CVE-2026-42585

Vulnerability Information
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Vulnerability Title
Netty: HTTP Request Smuggling due to malformed Transfer-Encoding
Source: CVE Program / CVE List V5
Vulnerability Description
Netty is an asynchronous, event-driven network application framework. Prior to 4.2.13.Final and 4.1.133.Final, Netty incorrectly parses malformed Transfer-Encoding, enabling request smuggling attacks. This vulnerability is fixed in 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:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
HTTP请求的解释不一致性(HTTP请求私运)
Source: CVE Program / CVE List V5
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和4.1.133.Final之前版本存在环境问题漏洞，该漏洞源于错误解析格式错误的Transfer-Encoding，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

Vendor Product Affected Versions CPE Subscribe
netty netty >= 4.2.0.Alpha1, < 4.2.13.Final -
io.netty netty-codec-http >= 4.2.0.Alpha1, < 4.2.13.Final -

II. Public POCs for CVE-2026-42585

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III. Intelligence Information for CVE-2026-42585

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Vendor Advisories for CVE-2026-42585 (1)

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-2026-42581 5.8 MEDIUM Netty: HTTP/1.0 TE+CL Coexistence Bypasses Smuggling Sanitization
CVE-2026-44248 5.3 MEDIUM Netty: Resource exhaustion in MqttDecoder
CVE-2026-42578 2.9 LOW Netty: HTTP Header Injection via HttpProxyHandler Disabled Validation

IV. Related Vulnerabilities

Same product: netty
Same vendor: netty
Same weakness: CWE-444

V. Comments for CVE-2026-42585

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