CVE-2026-42578

7.5 HIGH

Netty is an asynchronous, event-driven network application framework

Published: 2026-05-13 · Last updated: 2026-05-18

Severity and scoring

CVSS: 7.5 HIGH
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
CWE: CWE-113

Affected products

Vendor	Product
netty	netty

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

References

[NVD]https://nvd.nist.gov/vuln/detail/CVE-2026-42578
[Vendor advisory]https://github.com/netty/netty/security/advisories/GHSA-45q3-82m4-75jr
[Vendor advisory]https://github.com/netty/netty/security/advisories/GHSA-45q3-82m4-75jr

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CVE-2026-50560 — Netty is a network application framework for development of protocol servers and clients (5.3 MEDIUM)
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CVE-2026-50011 — Netty is a network application framework for development of protocol servers and clients (7.5 HIGH)
CVE-2026-50010 — Netty is a network application framework for development of protocol servers and clients (7.5 HIGH)
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