CVE-2026-80205
NLTK before 3.10.0 ReDoS via Text.findall() unvalidated regex
CVSS Score
7.5
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-1333 |
| Vendor | nltk |
| Product | nltk |
| Published | Aug 26, 2026 |
| Last Updated | Aug 26, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Affected Versions
nltk / nltk
0 < 3.10.0
References
Credits
🔍 infycore ekaf agent-kira