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CVE-2026-78681

8.7 high SSVC exploitation: none Analyzed
NVD · CVE.org

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.

Fix

Patch, vendor advisory and mitigation references on NVD 1

Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.

Change history 1

  1. First seenCVSS 8.7 · nltkNVD modified 2026-10-12 21:10

Affected (CPE criteria) 1

  • cpe:2.3:a:nltk:nltk:*:*:*:*:*:*:*:*

References 2