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-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.
- Affected products
- Nltk
- CVSS 4.0
- 8.7 HIGH
- CVSS 3.1
- 7.5 HIGH
- EPSS
- 0.4% (31th percentile)
- Weakness
- CWE-1333
- NVD status
- Received
- Published
- 2026-08-26
CVE-2026-80205 at NVD
No indexed exploits for CVE-2026-80205 yet
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No exploit for CVE-2026-80205 has been indexed yet. Our index is built from live traffic and upstream syncs, so this page can only say what it knows — not that no exploit exists.