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High severity7.3GHSA Advisory· Published May 13, 2026· Updated May 18, 2026

CVE-2026-42584

CVE-2026-42584

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.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected packages

Versions sourced from the GitHub Security Advisory.

PackageAffected versionsPatched versions
io.netty:netty-codec-httpMaven
>= 4.2.0.Alpha1, < 4.2.13.Final4.2.13.Final
io.netty:netty-codec-httpMaven
< 4.1.133.Final4.1.133.Final

Affected products

252

Patches

Vulnerability mechanics

References

3

News mentions

2