CVE-2026-33870
March 27, 2026
Netty is an asynchronous, event-driven network application framework. In versions prior to 4.1.132.Final and 4.2.10.Final, Netty incorrectly parses quoted strings in HTTP/1.1 chunked transfer encoding extension values, enabling request smuggling attacks. Versions 4.1.132.Final and 4.2.10.Final fix the issue.
Affected Packages
io.netty:netty-codec-http (JAVA):
Affected version(s) >=4.2.0.Alpha1 <4.2.10.FinalFix Suggestion:
Update to version 4.2.10.Finalio.netty:netty-codec-http (JAVA):
Affected version(s) >=4.2.0.Alpha1 <4.2.10.FinalFix Suggestion:
Update to version 4.2.10.Finalio.netty:netty-codec-http (JAVA):
Affected version(s) >=4.2.0.Alpha1 <4.2.10.FinalFix Suggestion:
Update to version 4.2.10.Finalio.netty:netty-codec-http (JAVA):
Affected version(s) >=4.0.0.Alpha1 <4.1.132.FinalFix Suggestion:
Update to version 4.1.132.Finalio.netty:netty-codec-http (JAVA):
Affected version(s) >=4.2.0.Alpha1 <4.2.10.FinalFix Suggestion:
Update to version 4.2.10.Finalio.netty:netty-codec-http (JAVA):
Affected version(s) >=4.0.0.Alpha1 <4.1.132.FinalFix Suggestion:
Update to version 4.1.132.Finalio.netty:netty-codec-http (JAVA):
Affected version(s) >=4.2.0.Alpha1 <4.2.10.FinalFix Suggestion:
Update to version 4.2.10.Finalio.netty:netty-codec-http (JAVA):
Affected version(s) >=4.0.0.Alpha1 <4.1.132.FinalFix Suggestion:
Update to version 4.1.132.Finalio.netty:netty-codec-http (JAVA):
Affected version(s) >=4.2.0.Alpha1 <4.2.10.FinalFix Suggestion:
Update to version 4.2.10.Finalio.netty:netty-codec-http (JAVA):
Affected version(s) >=4.0.0.Alpha1 <4.1.132.FinalFix Suggestion:
Update to version 4.1.132.Finalio.netty:netty-codec-http (JAVA):
Affected version(s) >=4.0.0.Alpha1 <4.1.132.FinalFix Suggestion:
Update to version 4.1.132.Finalio.netty:netty-codec-http (JAVA):
Affected version(s) >=4.0.0.Alpha1 <4.1.132.FinalFix Suggestion:
Update to version 4.1.132.Finalio.netty:netty-codec-http (JAVA):
Affected version(s) >=4.0.0.Alpha1 <4.1.132.FinalFix Suggestion:
Update to version 4.1.132.Finalio.netty:netty-codec-http (JAVA):
Affected version(s) >=4.0.0.Alpha1 <4.1.132.FinalFix Suggestion:
Update to version 4.1.132.Finalio.netty:netty-codec-http (JAVA):
Affected version(s) >=4.0.0.Alpha1 <4.1.132.FinalFix Suggestion:
Update to version 4.1.132.Finalio.netty:netty-codec-http (JAVA):
Affected version(s) >=4.2.0.Alpha1 <4.2.10.FinalFix Suggestion:
Update to version 4.2.10.Finalio.netty:netty-codec-http (JAVA):
Affected version(s) >=4.0.0.Alpha1 <4.1.132.FinalFix Suggestion:
Update to version 4.1.132.Finalio.netty:netty-codec-http (JAVA):
Affected version(s) >=4.2.0.Alpha1 <4.2.10.FinalFix Suggestion:
Update to version 4.2.10.Finalio.netty:netty-codec-http (JAVA):
Affected version(s) >=4.2.0.Alpha1 <4.2.10.FinalFix Suggestion:
Update to version 4.2.10.FinalRelated Resources (6)
Do you need more information?
Contact UsCVSS v4
Base Score:
8.7
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
HIGH
Vulnerable System Availability
NONE
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
7.5
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
HIGH
Availability
NONE
Weakness Type (CWE)
Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
EPSS
Base Score:
0.03
