Netty: HttpClientCodec response desynchronization_CVE-2026-42584

7.3 / 10

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

Description

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.

Basic Information

ID CVE-2026-42584

Source GitHub_M

Published May 13, 2026 at 18:10

Modified May 13, 2026 at 18:35

Affected Product

Vendor netty

Product netty

Version >= 4.2.0.Alpha1, < 4.2.13.Final

Affected Versions netty netty >= 4.2.0.Alpha1, < 4.2.13.Final
netty netty < 4.1.133.Final
io.netty netty-codec-http >= 4.2.0.Alpha1, < 4.2.13.Final
io.netty netty-codec-http < 4.1.133.Final

CWE Classification

CWE-444

References

github.com /netty/netty/security/advisories/GHSA-57rv-r2g8-2cj3

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