NLTK Vulnerable to REDoS

The nltk package is vulnerable to ReDoS regular expression denial of service. An attacker that is able to provide as an input to the readcomparisonblockhttps://github.com/nltk/nltk/blob/23f4b1c4b4006b0cb3ec278e801029557cec4e82/nltk/corpus/reader/comparativesents.pyL259 function in the file...