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Advisories

NLTK before 3.10.3 Entity Expansion DoS via ElementTree

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severity
high
date
Affecting

  • nltk >= 0, < 3.10.3

CWE
  • CWE-776 Improper Restriction of Recursive Entity References in DTDs ('XML Entity Expansion')
CVSS
8.7
CVSS V4 Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Description
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.

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