CVE-2026-42585

MEDIUM

Netty: HTTP Request Smuggling due to malformed Transfer-Encoding

Title source: cna
STIX 2.1

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.

References (1)

Core 1
Core References

Scores

CVSS v3 6.5
EPSS 0.0024
EPSS Percentile 14.7%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

CISA SSVC

Vulnrichment
Exploitation poc
Automatable yes
Technical Impact partial

Details

CWE
CWE-444
Status published
Products (7)
io.netty/netty-codec-http 0 - 4.1.133.FinalMaven
io.netty/netty-codec-http 4.2.0.Alpha1 - 4.2.13.FinalMaven
io.netty/netty-codec-http < 4.1.133.Final
io.netty/netty-codec-http >= 4.2.0.Alpha1, < 4.2.13.Final
netty/netty < 4.1.133
netty/netty < 4.1.133.Final
netty/netty >= 4.2.0.Alpha1, < 4.2.13.Final
Published May 13, 2026
Tracked Since May 14, 2026