A squid3 security update has been released for Debian GNU/Linux 9 LTS to address multiple security vulnerabilities.

DLA 2278-1: squid3 security update

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Debian LTS Advisory DLA-2278-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Markus Koschany
July 10, 2020   https://wiki.debian.org/LTS
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Package : squid3
Version : 3.5.23-5+deb9u2
CVE ID : CVE-2018-19132 CVE-2019-12519 CVE-2019-12520
CVE-2019-12521 CVE-2019-12523 CVE-2019-12524
CVE-2019-12525 CVE-2019-12526 CVE-2019-12528
CVE-2019-12529 CVE-2019-13345 CVE-2019-18676
CVE-2019-18677 CVE-2019-18678 CVE-2019-18679
CVE-2019-18860 CVE-2020-8449 CVE-2020-8450
CVE-2020-11945
Debian Bug : 950802 931478 950925 912294

It was found that Squid, a high-performance proxy caching server for
web clients, has been affected by multiple security vulnerabilities.
Due to incorrect input validation and URL request handling it was
possible to bypass access restrictions for restricted HTTP servers
and to cause a denial-of-service.

For Debian 9 stretch, these problems have been fixed in version
3.5.23-5+deb9u2.

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