CVE-2026-78681

High

Open

TLP:CLEAR

NLTK before 3.10.3 Entity Expansion DoS via ElementTree

NVD CVE.org

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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.

Details

CVSS Score: 8.7
CVSS 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
Confidence: 90%
Published: Aug 25, 2026
Last Modified: Aug 25, 2026

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