Python before 2.6.8, 2.7.x before 2.7.3, 3.x before 3.1.5, and 3.2.x before 3.2.3 computes hash values without restricting the ability to trigger hash collisions predictably, which allows context-dependent attackers to cause a denial of service (CPU consumption) via crafted input to an application that maintains a hash table.
https://bugzilla.redhat.com/show_bug.cgi?id=750555
http://www.ubuntu.com/usn/USN-1616-1
http://www.ubuntu.com/usn/USN-1615-1
http://www.ubuntu.com/usn/USN-1596-1
http://www.ubuntu.com/usn/USN-1592-1
http://www.openwall.com/lists/oss-security/2012/03/10/3
http://secunia.com/advisories/51089
http://secunia.com/advisories/51087
http://secunia.com/advisories/50858
http://python.org/download/releases/3.2.3/
http://python.org/download/releases/3.1.5/
http://python.org/download/releases/2.7.3/
http://python.org/download/releases/2.6.8/
http://mail.python.org/pipermail/python-dev/2012-January/115892.html
http://mail.python.org/pipermail/python-dev/2011-December/115116.html
http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00040.html
http://lists.apple.com/archives/security-announce/2013/Oct/msg00004.html