varnish is vulnerable to HTTP request smuggling. The vulnerability exists due to a lack of sanitization in the HTTP/1 connections.
docs.varnish-software.com/security/VSV00008/
lists.debian.org/debian-lts-announce/2022/02/msg00014.html
lists.fedoraproject.org/archives/list/[email protected]/message/UMMDMQWNAE3BTSZUHXQHVAMZC5TLHLYT/
secdb.alpinelinux.org/edge/main.yaml
varnish-cache.org/security/VSV00008.html
www.debian.org/security/2022/dsa-5088