CVE-2026-42580
Published:May 13, 2026
Updated:May 18, 2026
Netty is an asynchronous, event-driven network application framework. Prior to 4.2.13.Final and 4.1.133.Final, Netty's chunk size parser silently overflows int, enabling request smuggling attacks. This vulnerability is fixed in 4.2.13.Final and 4.1.133.Final.
Affected Packages
https://github.com/netty/netty.git (GITHUB):
Affected version(s) >=netty-3.2.4.Final <netty-4.1.133.FinalFix Suggestion:
Update to version netty-4.1.133.Finalhttps://github.com/netty/netty.git (GITHUB):
Affected version(s) >=netty-4.2.0.Alpha1 <netty-4.2.13.FinalFix Suggestion:
Update to version netty-4.2.13.Finalio.netty:netty-codec-http (JAVA):
Affected version(s) >=4.2.0.Alpha1 <4.2.13.FinalFix Suggestion:
Update to version 4.2.13.Finalio.netty:netty-codec-http (JAVA):
Affected version(s) >=4.0.0.Alpha1 <4.1.133.FinalFix Suggestion:
Update to version 4.1.133.Finalio.netty:netty-codec-http (JAVA):
Affected version(s) >=4.0.0.Alpha1 <4.1.133.FinalFix Suggestion:
Update to version 4.1.133.FinalRelated Resources (3)
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Contact UsCVSS v4
Base Score:
6.9
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
LOW
Vulnerable System Availability
LOW
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
6.5
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
LOW
Availability
LOW
Weakness Type (CWE)
EPSS
Base Score:
0.04