The vulnerability of the difflib.IS_LINE_JUNK method in the Python interpreter allows a attacker to cause a service failure.

The vulnerability of the difflib.ISLINEJUNK method in the Python interpreter exists due to insufficient validation of input data. Exploiting this vulnerability can allow an attacker, operating remotely, to cause service failures...

python: DOS via regular expression backtracking in difflib.IS_LINE_JUNK method in difflib

A flaw was found in the way catastrophic backtracking was implemented in python's difflib.ISLINEJUNK method. An attacker could use this flaw to cause denial of service...