An issue was discovered in Squid before 4.10. Due to incorrect input validation, it can interpret crafted HTTP requests in unexpected ways to access server resources prohibited by earlier security filters.
lists.opensuse.org/opensuse-security-announce/2020-03/msg00012.html
lists.opensuse.org/opensuse-security-announce/2020-05/msg00010.html
www.squid-cache.org/Advisories/SQUID-2020_1.txt
www.squid-cache.org/Versions/v3/3.5/changesets/SQUID-2020_1.patch
www.squid-cache.org/Versions/v3/3.5/changesets/squid-3.5-8e657e835965c3a011375feaa0359921c5b3e2dd.patch
www.squid-cache.org/Versions/v4/changesets/SQUID-2020_1.patch
www.squid-cache.org/Versions/v4/changesets/squid-4-b3a0719affab099c684f1cd62b79ab02816fa962.patch
www.squid-cache.org/Versions/v4/changesets/squid-4-d8e4715992d0e530871519549add5519cbac0598.patch
lists.debian.org/debian-lts-announce/2020/07/msg00009.html
lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/G6W2IQ7QV2OGREFFUBNVZIDD3RJBDE4R/
lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TSU6SPANL27AGK5PCGBJOKG4LUWA555J/
security.gentoo.org/glsa/202003-34
security.netapp.com/advisory/ntap-20210304-0002/
usn.ubuntu.com/4289-1/
www.debian.org/security/2020/dsa-4682