https://vulnerability.circl.lu/rss/recent/all/10 Most recent entries from all 2026-10-08T23:04:27.870567+00:00 Vulnerability-Lookup info@circl.lu python-feedgen Contains only the most 10 recent entries. https://vulnerability.circl.lu/vuln/cve-2021-3842 CVE-2021-3842 — Inefficient Regular Expression Complexity in nltk/nltk 2026-10-08T23:04:28.975894+00:00

Affected: nltk/nltk

nltk is vulnerable to Inefficient Regular Expression Complexity

 https://vulnerability.circl.lu/vuln/usn-7365-1 USN-7365-1 — nltk vulnerabilities 2026-10-08T23:04:28.975995+00:00

Affected: Ubuntu:Pro:14.04:LTS: nltk, Ubuntu:Pro:16.04:LTS: nltk, Ubuntu:Pro:18.04:LTS: nltk, Ubuntu:Pro:20.04:LTS: nltk

It was discovered that NLTK contained a regex that is susceptible to catastrophic backtracking. An attacker could possibly use this issue to cause a denial of service. (CVE-2021-3842, CVE-2021-43854)