In Twisted Web through 19.10.0, there was an HTTP request splitting vulnerability. When presented with two content-length headers, it ignored the first header. When the second content-length value was set to zero, the request body was interpreted as a pipelined request.
github.com/advisories/GHSA-h96w-mmrf-2h6v
know.bishopfox.com/advisories
know.bishopfox.com/advisories/twisted-version-19.10.0
lists.fedoraproject.org/archives/list/[email protected]/message/6ISMZFZBWW4EV6ETJGXAYIXN3AT7GBPL/
lists.fedoraproject.org/archives/list/[email protected]/message/YW3NIL7VXSGJND2Q4BSXM3CFTAFU6T7D/
security.gentoo.org/glsa/202007-24
usn.ubuntu.com/4308-1/
usn.ubuntu.com/4308-2/
www.oracle.com/security-alerts/cpuoct2020.html