NetSight
IP …
high7.3

CVE-2026-42584

Netty is an asynchronous, event-driven network application framework.

Impact

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 packages

EcosystemPackageAffectedFixed in
mavenio.netty:netty-codec-http>= 4.2.0.Alpha1, <= 4.2.12.Final4.2.13.Final

Affected products

VendorProductAffected versions
NettyNetty
before 4.1.133
from 4.2.0 before 4.2.13

Weakness classification

CWE-444

References