PT-2026-81156 · Pypi · Nltk
CVE-2026-78681
·
Published
2026-08-25
·
Updated
2026-09-08
CVSS v4.0
8.7
High
| Vector | AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N |
Name of the Vulnerable Software and Affected Versions
NLTK versions prior to 3.10.3
Description
Multiple modules use the
xml.etree.ElementTree library to parse XML, which honors entity declarations in document DTDs (Document Type Definitions). This allows attackers to craft XML payloads with nested entity declarations that expand significantly in memory, leading to a denial of service.Recommendations
Update NLTK to version 3.10.3 or later.
Exploit
Fix
DoS
XML Entity Expansion
Found an issue in the description? Have something to add? Feel free to write us 👾
Weakness Enumeration
Related Identifiers
Affected Products
Nltk