CVE-2026-42585

Publication date 13 May 2026

Last updated 8 June 2026

Ubuntu priority

Cvss 3 Severity Score

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.

Status

Show unmaintained releases

Package	Ubuntu Release	Status
netty	26.04 LTS resolute	Fixed 1:4.1.48-16ubuntu0.1~esm2
	25.10 questing	Vulnerable
	24.04 LTS noble	Fixed 1:4.1.48-9ubuntu0.1+esm3
	22.04 LTS jammy	Fixed 1:4.1.48-4+deb11u2ubuntu0.1+esm3
	20.04 LTS focal	Fixed 1:4.1.45-1ubuntu0.1~esm6
	18.04 LTS bionic	Fixed 1:4.1.7-4ubuntu0.1+esm6
	14.04 LTS trusty	Fixed 1:3.2.6.Final-2+deb8u2ubuntu0.1~esm1

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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: 485f11d Upstream: 5d60b87

Severity score breakdown

Parameter	Value
Base score	6.5 · Medium
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	Low
Integrity impact	Low
Availability impact	None
Vector	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

References

Related Ubuntu Security Notices (USN)

USN-8401-1
Netty vulnerabilities
8 June 2026