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CVE PROGRAM SOURCE RECORD8.7 High

CVE-2026-78681

NLTK before 3.10.3 Entity Expansion DoS via ElementTree

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Status
Published
Published
Updated
Assigning organization
VulnCheck

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

nltk nltk

Default version status: unaffected

  • 0 to < 3.10.3affected
  • 3.10.3unaffected
pkg:pypi/nltk

References