Debian Security Advisory

DLA-2920-1 varnish -- LTS security update

Date Reported:
14 Feb 2022
Affected Packages:
Security database references:
In the Debian bugtracking system: Bug 1004433.
In Mitre's CVE dictionary: CVE-2022-23959.
More information:

James Kettle discovered that a request smuggling attack can be performed on HTTP/1 connections on Varnish servers, high-performance web accelerators. The smuggled request would be treated as an additional request by the Varnish server which may lead to information disclosure and cache poisoning.

For Debian 9 stretch, this problem has been fixed in version 5.0.0-7+deb9u3.

We recommend that you upgrade your varnish packages.

For the detailed security status of varnish 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: