HIGH 8.7 NVD
CVE-2026-78681
NLTK versions before 3.10.3 use xml.etree.ElementTree to parse XML in multiple modules, which honors entity declarations in document DTDs. Attackers can craft X
NLTK versions before 3.10.3 use xml.etree.ElementTree to parse XML in multiple modules, which honors entity declarations in document DTDs. Attackers can craft XML payloads with nested entity declarations that expand from hundreds of bytes to megabytes in memory, causing denial of service.
References
- https://github.com/nltk/nltk/security/advisories/GHSA-97qj-x29f-37w7
- https://www.vulncheck.com/advisories/nltk-before-entity-expansion-dos-via-elementtree
This high severity vulnerability with a CVSS score of 8.7 was published on 2026-08-25 via NVD.
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