CVE-2021-3842: Debian Linux

High severity, CVSS 7.5. EPSS: 1.5% chance of exploitation in the next 30 days.

nltk is vulnerable to Inefficient Regular Expression Complexity

Affected products

• Debian Debian Linux: version 9.0 only; version 10.0 only; version 11.0 only
• Fedoraproject Fedora: version 35 only
• Nltk Nltk: before 3.6.6 (fixed in 3.6.6)

Published 2022-01-04. Last modified 2026-06-17.