CVE-2026-42584

Netty is an asynchronous, event-driven network application framework. Prior to 4.2.13.Final and 4.1.133.Final, HttpClientCodec pairs each inbound response with an outbound request by queue.poll() once per response, including for 1xx. If the client pipelines GET then HEAD and the server sends 103, then 200 with GET body, then 200 for HEAD, the queue pairs HEAD with the first 200. The HEAD rule then skips reading that message’s body, so the GET entity bytes stay on the stream and the following 200 is parsed from the wrong offset. This vulnerability is fixed in 4.2.13.Final and 4.1.133.Final.

CVSS v3 7.3 HIGH

7.3^/10

CVSS v3 : HIGH

Vector :

Exploitability : 3.9 / Impact : 3.4

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact LOW

Integrity Impact LOW

Availability Impact LOW

Scope UNCHANGED

References

Link	Resource
https://github.com/netty/netty/security/advisories/GHSA-57rv-r2g8-2cj3	Exploit Vendor Advisory
https://github.com/netty/netty/security/advisories/GHSA-57rv-r2g8-2cj3	Exploit Vendor Advisory

Configurations

Configuration 1 (hide)

OR	cpe:2.3:a:netty:netty::::::::
	cpe:2.3:a:netty:netty::::::::

History

18 May 2026, 12:15

Type	Values Removed	Values Added
First Time		Netty netty Netty
References	~~() https://github.com/netty/netty/security/advisories/GHSA-57rv-r2g8-2cj3 -~~	() https://github.com/netty/netty/security/advisories/GHSA-57rv-r2g8-2cj3 - Exploit, Vendor Advisory
CPE		cpe:2.3:a:netty:netty::::::::

13 May 2026, 19:17

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-05-13 19:17

Updated : 2026-05-18 12:15

NVD link : CVE-2026-42584

Mitre link : CVE-2026-42584

CVE.ORG link : CVE-2026-42584

JSON object : View

Products Affected

netty

netty

CWE

CWE-444

Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')

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