The net/http library in net/textproto/reader.go in Go before 1.4.3 does...

Vulnerability Description

The net/http library in net/textproto/reader.go in Go before 1.4.3 does not properly parse HTTP header keys, which allows remote attackers to conduct HTTP request smuggling attacks via a space instead of a hyphen, as demonstrated by "Content Length" instead of "Content-Length."

References

• http://seclists.org/oss-sec/2015/q3/292
• http://lists.fedoraproject.org/pipermail/package-announce/2015-October/167997.html
• http://lists.fedoraproject.org/pipermail/package-announce/2015-October/168029.html
• http://rhn.redhat.com/errata/RHSA-2016-1538.html
• https://bugzilla.redhat.com/show_bug.cgi?id=1250352
• http://seclists.org/oss-sec/2015/q3/294
• http://seclists.org/oss-sec/2015/q3/237
• http://www.securityfocus.com/bid/76281
• https://github.com/golang/go/commit/117ddcb83d7f42d6aa72241240af99ded81118e9