VULNERABILITY INTELLIGENCE
CVE-2026-81723
CVSS score6.3 MEDIUM
EPSS probability0.28%
CISA KEVNot currently listed
Published2026-08-27
Last modified2026-09-24
CVSS vectorCVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
Description
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.
Weakness classification
- CWE-400: Uncontrolled Resource Consumption