CVE-2026-80205 — NLTK before 3.10.0 ReDoS via Text.findall() unvalidated regex
NLTK versions before 3.10.0 contain a regular expression denial of service vulnerability in Text.findall() and TokenSearcher.findall() methods that accept user-supplied regular …
Published: 2026-08-26 · CVSS: 8.7 · CVSS 4.0
NLTK versions before 3.10.0 contain a regular expression denial of service vulnerability in Text.findall() and TokenSearcher.findall() methods that accept user-supplied regular expressions without validation or timeout. Attackers can supply crafted regex patterns that cause catastrophic backtracking, resulting in indefinite CPU saturation and denial of service to all users of the Python process.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7