A squid3 security update has been released for Debian GNU/Linux 9 LTS to address an improper input validation.

DLA 2598-1: squid3 security update

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Debian LTS Advisory DLA-2598-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Utkarsh Gupta
March 19, 2021   https://wiki.debian.org/LTS
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Package : squid3
Version : 3.5.23-5+deb9u6
CVE ID : CVE-2020-25097
Debian Bug : 985068

Due to improper input validation, Squid is vulnerable to an HTTP
Request Smuggling attack.

This problem allows a trusted client to perform HTTP Request
Smuggling and access services otherwise forbidden by Squid
security controls.

For Debian 9 stretch, this problem has been fixed in version
3.5.23-5+deb9u6.

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