See https://vinyl-cache.org/security/VSV00002.html for details.
For the stable distribution (stretch), this problem has been fixed in
version 5.0.0-7+deb9u2.
We recommend that you upgrade your varnish packages.
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/
Get the latest Linux and open source security news straight to your inbox.