Debian LTS: DLA-2598-1: squid3 security update
Summary
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:
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