HIGH 8.7 NVD
CVE-2026-80205
NLTK versions before 3.10.0 contain a regular expression denial of service vulnerability in Text.findall() and TokenSearcher.findall() methods that accept user-
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.
References
- https://github.com/nltk/nltk/security/advisories/GHSA-rrv8-h7p8-rx55
- https://www.vulncheck.com/advisories/nltk-before-3.10.0-redos-via-text-findall-unvalidated
This high severity vulnerability with a CVSS score of 8.7 was published on 2026-08-26 via NVD.
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