A tomcat9 regression update has been released for Debian GNU/Linux 11 to address an issue introduced by the previous update.

[SECURITY] [DSA 5522-2] tomcat9 regression update

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Debian Security Advisory DSA-5522-2 security@debian.org
https://www.debian.org/security/ Markus Koschany
October 12, 2023 https://www.debian.org/security/faq
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Package : tomcat9
CVE ID : CVE-2023-44487
Debian Bug : 1053820

The patch to address CVE-2023-44487 (Rapid Reset Attack) was incomplete and
caused a regression when using asynchronous I/O (the default for NIO and NIO2).
DATA frames must be included when calculating the HTTP/2 overhead count to
ensure that connections are not prematurely terminated.

For the oldstable distribution (bullseye), this problem has been fixed
in version 9.0.43-2~deb11u8.

We recommend that you upgrade your tomcat9 packages.

For the detailed security status of tomcat9 please refer to
its security tracker page at:
https://security-tracker.debian.org/tracker/tomcat9

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://www.debian.org/security/