CVE-2026-33236
NLTK (Natural Language Toolkit) is a suite of open source Python modules, data sets, and tutorials supporting research and development in Natural Language Processing.
Published Mar 20, 2026 · updated Jul 21, 2026 · nltk nltk
NLTK (Natural Language Toolkit) is a suite of open source Python modules, data sets, and tutorials supporting research and development in Natural Language Processing. In versions 3.9.3 and prior, the NLTK downloader does not validate the and attributes when processing remote XML index files. Attackers can control a remote XML index server to provide malicious values containing path traversal sequences (such as ), which can lead to arbitrary directory creation, arbitrary file creation, and arbitrary file overwrite. Commit 89fe2ec2c6bae6e2e7a46dad65cc34231976ed8a patches the issue.
Code
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Timeline
Detection, updates, and resolution for this record.
Mar 20, 2026 · NIST NVD
Detected
NLTK (Natural Language Toolkit) is a suite of open source Python modules, data sets, and tutorials supporting research and development in Natural Language Processing. In versions 3.9.3 and prior, the NLTK downloader does not validate the and attributes when processing remote XML index files. Attackers can control a remote XML index server to provide malicious values containing path traversal seque
Jul 21, 2026 · NIST NVD
Updated
NLTK (Natural Language Toolkit) is a suite of open source Python modules, data sets, and tutorials supporting research and development in Natural Language Processing. In versions 3.9.3 and prior, the NLTK downloader does not validate the and attributes when processing remote XML index files. Attackers can control a remote XML index server to provide malicious values containing path traversal seque
Affected
- cpe nltk/nltkversion unspecified
Sources
- CVE.orgVulnerability recordCVE-2026-33236
Official CVE identifier
cve.org - NIST NVDVulnerability recordCVE-2026-33236
NLTK (Natural Language Toolkit) is a suite of open source Python modules, data sets, and tutorials supporting research and development in Natural Language Processing. In versions 3.9.3 and prior, the NLTK downloader does not validate the and attributes when processi
nvd.nist.gov