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CVE-2026-33236

Medium priority
Needs evaluation

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...

1 affected package

nltk

Package 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
nltk Needs evaluation Needs evaluation Needs evaluation Needs evaluation
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CVE-2026-33231

Medium priority
Needs evaluation

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, `nltk.app.wordnet_app` allows...

1 affected package

nltk

Package 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
nltk Needs evaluation Needs evaluation Needs evaluation Needs evaluation
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CVE-2026-33230

Medium priority
Needs evaluation

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, `nltk.app.wordnet_app` contains a...

1 affected package

nltk

Package 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
nltk Needs evaluation Needs evaluation Needs evaluation Needs evaluation
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CVE-2026-0846

Medium priority
Vulnerable

A vulnerability in the `filestring()` function of the `nltk.util` module in nltk version 3.9.2 allows arbitrary file read due to improper validation of input paths. The function directly opens files specified by user input without...

1 affected package

nltk

Package 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
nltk Vulnerable Vulnerable Vulnerable Vulnerable
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CVE-2026-0848

Medium priority
Vulnerable

NLTK versions <=3.9.2 are vulnerable to arbitrary code execution due to improper input validation in the StanfordSegmenter module. The module dynamically loads external Java .jar files without verification or sandboxing. An...

1 affected package

nltk

Package 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
nltk Vulnerable Vulnerable Vulnerable Vulnerable
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CVE-2026-0847

Medium priority
Vulnerable

A vulnerability in NLTK versions up to and including 3.9.2 allows arbitrary file read via path traversal in multiple CorpusReader classes, including WordListCorpusReader, TaggedCorpusReader, and BracketParseCorpusReader. These...

1 affected package

nltk

Package 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
nltk Vulnerable Vulnerable Vulnerable Vulnerable
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CVE-2025-14009

High priority
Vulnerable

A critical vulnerability exists in the NLTK downloader component of nltk/nltk, affecting all versions. The _unzip_iter function in nltk/downloader.py uses zipfile.extractall() without performing path validation or security checks....

1 affected package

nltk

Package 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
nltk Vulnerable Vulnerable Vulnerable Vulnerable
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CVE-2024-39705

Medium priority
Ignored

NLTK through 3.8.1 allows remote code execution if untrusted packages have pickled Python code, and the integrated data package download functionality is used. This affects, for example, averaged_perceptron_tagger and punkt.

1 affected package

nltk

Package 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
nltk Ignored Ignored Ignored Ignored
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CVE-2021-3842

Medium priority

Some fixes available 4 of 7

nltk is vulnerable to Inefficient Regular Expression Complexity

1 affected package

nltk

Package 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
nltk Not affected Not affected Fixed Fixed
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CVE-2021-43854

Medium priority

Some fixes available 4 of 7

NLTK (Natural Language Toolkit) is a suite of open source Python modules, data sets, and tutorials supporting research and development in Natural Language Processing. Versions prior to 3.6.5 are vulnerable to regular expression...

1 affected package

nltk

Package 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
nltk Not affected Not affected Fixed Fixed
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