Go before 1.12.10 and 1.13.x before 1.13.1 allow HTTP Request Smuggling.
https://security.netapp.com/advisory/ntap-20191122-0004/
https://lists.debian.org/debian-lts-announce/2021/03/msg00015.html
https://lists.debian.org/debian-lts-announce/2021/03/msg00014.html
https://groups.google.com/forum/#%21msg/golang-announce/cszieYyuL9Q/g4Z7pKaqAgAJ
https://github.com/golang/go/issues/34540
https://access.redhat.com/errata/RHSA-2020:0652
https://access.redhat.com/errata/RHSA-2020:0329
https://access.redhat.com/errata/RHSA-2020:0101
http://lists.opensuse.org/opensuse-security-announce/2019-11/msg00044.html
http://lists.opensuse.org/opensuse-security-announce/2019-11/msg00043.html