CVE-2025-58056

Description

Netty is an asynchronous event-driven network application framework for development of maintainable high performance protocol servers and clients. In versions 4.1.124.Final, and 4.2.0.Alpha3 through 4.2.4.Final, Netty incorrectly accepts standalone newline characters (LF) as a chunk-size line terminator, regardless of a preceding carriage return (CR), instead of requiring CRLF per HTTP/1.1 standards. When combined with reverse proxies that parse LF differently (treating it as part of the chunk extension), attackers can craft requests that the proxy sees as one request but Netty processes as two, enabling request smuggling attacks. This is fixed in versions 4.1.125.Final and 4.2.5.Final.

Why is this CVE low priority?

http smuggling issue

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Status

Show unmaintained releases

Package	Ubuntu Release	Status
netty-3.9	25.10 questing	Not in release
	25.04 plucky	Not in release
	24.04 LTS noble	Not in release
	22.04 LTS jammy	Not in release
	18.04 LTS bionic	Needs evaluation
	16.04 LTS xenial	Needs evaluation
netty	25.10 questing	Fixed 1:4.1.48-10ubuntu0.25.10.2
	25.04 plucky	Fixed 1:4.1.48-10ubuntu0.25.04.2
	24.04 LTS noble	Fixed 1:4.1.48-9ubuntu0.1
	22.04 LTS jammy	Fixed 1:4.1.48-4+deb11u2ubuntu0.1
	20.04 LTS focal	Fixed 1:4.1.45-1ubuntu0.1~esm4
	18.04 LTS bionic	Fixed 1:4.1.7-4ubuntu0.1+esm5
	16.04 LTS xenial	Fixed 1:4.0.34-1ubuntu0.1~esm3
	14.04 LTS trusty	Ignored backport too intrusive

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Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
netty	Upstream: 39d3ecf

References

Related Ubuntu Security Notices (USN)

USN-7918-1
Netty vulnerabilities
9 December 2025