CVE-2026-81723
NLTK before 3.10.3 Quadratic CPU Exhaustion via XMLCorpusView
CVSS Score
3.7
EPSS Score
0.0%
EPSS Percentile
0th
NLTK versions before 3.10.3 contain a quadratic CPU exhaustion vulnerability in XMLCorpusView._read_xml_fragment() that rescans accumulated XML fragments on every 1 KiB block read. Attackers can provide malformed XML corpus files to cause severe CPU consumption and denial of service through affected readers like BNCCorpusReader.
| CWE | CWE-400 |
| Vendor | nltk |
| Product | nltk |
| Published | Aug 27, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
Low
Affected Versions
nltk / nltk
0 < 3.10.3
References
Credits
🔍 ibfavas