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wid-sec-w-2026-0846  ·  Published 2026-03-24  ·  View on BSI CERT-Bund ↗

Netty: Multiple Vulnerabilities

CVSS 8.7 HIGH

Risk Summary

Netty is an asynchronous, event-driven network application framework. In versions prior to 4.1.132.Final and 4.2.10.Final, Netty incorrectly parses quoted strings in HTTP/1.1 chunked transfer encoding extension values, enabling request smuggling attacks. Versions 4.1.132.Final and 4.2.10.Final fix the issue. Netty is an asynchronous, event-driven network application framework. In versions prior to 4.1.132.Final and 4.2.10.Final, a remote user can trigger a Denial of Service (DoS) against a Netty HTTP/2 server by sending a flood of `CONTINUATION` frames. The server's lack of a limit on the number of `CONTINUATION` frames, combined with a bypass of existing size-based mitigations using zero-byte frames, allows an user to cause excessive CPU consumption with minimal bandwidth, rendering the server unresponsive. Versions 4.1.132.Final and 4.2.10.Final fix the issue.

Affected Vendors

Open Source SUSE

Affected Products (4)

Open Source · Netty <4.2.11
Open Source · Netty 4.2.11
Open Source · Netty <4.1.132
Open Source · Netty 4.1.132

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