A netty security update has been released for both Debian GNU/Linux 9 and 10

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Debian Security Advisory DSA-4597-1 security@debian.org
https://www.debian.org/security/ Salvatore Bonaccorso
January 03, 2020 https://www.debian.org/security/faq
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Package : netty
CVE ID : CVE-2019-16869
Debian Bug : 941266

It was reported that Netty, a Java NIO client/server framework, is prone
to a HTTP request smuggling vulnerability due to mishandling whitespace
before the colon in HTTP headers.

For the oldstable distribution (stretch), this problem has been fixed
in version 1:4.1.7-2+deb9u1.

For the stable distribution (buster), this problem has been fixed in
version 1:4.1.33-1+deb10u1.

We recommend that you upgrade your netty packages.

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

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/