An issue was discovered in Squid before 4.10. Due to incorrect buffer management, a remote client can cause a buffer overflow in a Squid instance acting as a reverse proxy.
https://www.debian.org/security/2020/dsa-4682
https://usn.ubuntu.com/4289-1/
https://security.netapp.com/advisory/ntap-20210304-0002/
https://security.gentoo.org/glsa/202003-34
https://lists.debian.org/debian-lts-announce/2020/07/msg00009.html
http://www.squid-cache.org/Versions/v4/changesets/SQUID-2020_1.patch
http://www.squid-cache.org/Versions/v3/3.5/changesets/SQUID-2020_1.patch
http://www.squid-cache.org/Advisories/SQUID-2020_1.txt
http://lists.opensuse.org/opensuse-security-announce/2020-05/msg00010.html
http://lists.opensuse.org/opensuse-security-announce/2020-03/msg00012.html