A squid3 regression update has been released for Debian GNU/Linux 9 LTS to address a regression due to the updated fix for CVE-2019-12529.

DLA 2278-3: squid3 regression update

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Debian LTS Advisory DLA-2278-3 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Markus Koschany
September 04, 2020   https://wiki.debian.org/LTS
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Package : squid3
Version : 3.5.23-5+deb9u4
Debian Bug : 969526

The update of squid3 released as DLA-2278-2 introduced a regression
due to the updated fix for CVE-2019-12529. The new Kerberos
authentication code prevented base64 token negotiation. Updated squid3
packages are now
available to correct this issue.

For Debian 9 stretch, this problem has been fixed in version
3.5.23-5+deb9u4.

We recommend that you upgrade your squid3 packages.

For the detailed security status of squid3 please refer to
its security tracker page at:
  https://security-tracker.debian.org/tracker/squid3

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