XML External Entity (XXE) vulnerability in PySAML2 4.4.0 and earlier allows remote attackers to read arbitrary files via a crafted SAML XML request or response.
https://github.com/rohe/pysaml2/pull/379
https://github.com/rohe/pysaml2/issues/366
https://github.com/rohe/pysaml2/commit/6e09a25d9b4b7aa7a506853210a9a14100b8bc9b
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=850716
https://access.redhat.com/errata/RHSA-2017:0938
https://access.redhat.com/errata/RHSA-2017:0937
https://access.redhat.com/errata/RHSA-2017:0936
http://www.securityfocus.com/bid/97692