Debian 9987 Published by

A netty security update has been released for Debian GNU/Linux 11 and 12 to address two security vulnerabilities.

[SECURITY] [DSA 5558-1] netty security update

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Debian Security Advisory DSA-5558-1 Markus Koschany
November 18, 2023
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Package : netty
CVE ID : CVE-2023-34462 CVE-2023-44487
Debian Bug : 1038947 1054234

Two security vulnerabilities have been discovered in Netty, a Java NIO
client/server socket framework.


It might be possible for a remote peer to send a client hello packet during
a TLS handshake which lead the server to buffer up to 16 MB of data per
connection. This could lead to a OutOfMemoryError and so result in a denial
of service.


The HTTP/2 protocol allowed a denial of service (server resource
consumption) because request cancellation can reset many streams quickly.
This problem is also known as Rapid Reset Attack.

For the oldstable distribution (bullseye), these problems have been fixed
in version 1:4.1.48-4+deb11u2.

For the stable distribution (bookworm), these problems have been fixed in
version 1:4.1.48-7+deb12u1.

We recommend that you upgrade your netty packages.

For the detailed security status of netty please refer to
its security tracker page at:

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: