by Kastro CVE-2026-42584
netty netty — Netty: HttpClientCodec response desynchronization
Description · from the CVE record
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.
Affected
ProductAffectedFixed inSource
netty>= 4.2.0.Alpha1, < 4.2.13.Final–CNA
netty< 4.1.133.Final–CNA
netty-codec-http>= 4.2.0.Alpha1, < 4.2.13.Final–CNA
netty-codec-http< 4.1.133.Final–CNA
Cryostat 4 on RHEL 9see advisory4.2.0-10redhat-SADP
Cryostat 4 on RHEL 9see advisory4.2.0-10redhat-SADP
Cryostat 4 on RHEL 9see advisory4.2.0-10redhat-SADP
Red Hat AMQ Broker 7.13.6see advisorycodec-httpredhat-SADP
Red Hat AMQ Broker 7.14.1see advisorycodec-httpredhat-SADP
Red Hat build of Apache Camel 4.18.1.P1 for Spring Boot 3.5.16see advisorycodec-httpredhat-SADP
Red Hat build of Quarkus 3.27.4see advisorycodec-httpredhat-SADP
Red Hat build of Quarkus 3.33.2see advisory–redhat-SADP
Scores by source
NVD9.1CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
GitHub_M (CNA)7.3CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
redhat-SADP (CNA)7.3CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
CISA ADPSSVCExploitation: poc · Automatable: yes · Technical impact: partial