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Vulnerability Details 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.

Exploit prediction scoring system (EPSS) score

EPSS Score 0.008

EPSS Ranking 54.2%

CVSS Severity

CVSS v3 Score 7.3

References

Products affected by CVE-2026-42584

Netty » Netty » Version: 4.2.0

cpe:2.3:a:netty:netty:4.2.0
Netty » Netty » Version: 4.2.1

cpe:2.3:a:netty:netty:4.2.1
Netty » Netty » Version: 4.2.10

cpe:2.3:a:netty:netty:4.2.10
Netty » Netty » Version: 4.2.11

cpe:2.3:a:netty:netty:4.2.11
Netty » Netty » Version: 4.2.12

cpe:2.3:a:netty:netty:4.2.12
Netty » Netty » Version: 4.2.2

cpe:2.3:a:netty:netty:4.2.2
Netty » Netty » Version: 4.2.3

cpe:2.3:a:netty:netty:4.2.3
Netty » Netty » Version: 4.2.4

cpe:2.3:a:netty:netty:4.2.4
Netty » Netty » Version: 4.2.5

cpe:2.3:a:netty:netty:4.2.5
Netty » Netty » Version: 4.2.6

cpe:2.3:a:netty:netty:4.2.6
Netty » Netty » Version: 4.2.7

cpe:2.3:a:netty:netty:4.2.7
Netty » Netty » Version: 4.2.8

cpe:2.3:a:netty:netty:4.2.8
Netty » Netty » Version: 4.2.9

cpe:2.3:a:netty:netty:4.2.9

Vulnerabilities

Vulnerable Software

Vulnerability Details CVE-2026-42584

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