CVE-2026-81725

NLTK before 3.10.3 contains a regular expression denial of service vulnerability in Pl196xCorpusReader that allows attackers to cause quadratic CPU consumption by supplying malformed TEI blocks with many unmatched opening tags. Attackers can exploit lazy regex patterns in the readblock method...

CVE-2026-81725: Uncontrolled Resource Consumption

NLTK before 3.10.3 contains a regular expression denial of service vulnerability in Pl196xCorpusReader that allows attackers to cause quadratic CPU consumption by supplying malformed TEI blocks with many unmatched opening tags. Attackers can exploit lazy regex patterns in the readblock method...

CVE-2026-12072

A path-traversal vulnerability in "NKJPCorpusReader" allows an attacker who can influence the "fileids" argument of its public read methods "header", "raw", "words", "sents", "taggedwords" to read files outside the corpus root. The reader builds the file path with no containment check and opens i...