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CVE-2026-12243

Medium priority
Needs evaluation

NLTK version 3.9.4 is vulnerable to a path traversal attack due to an incomplete fix for GitHub Issue #3504. The `_UNSAFE_NO_PROTOCOL_RE` regex in `nltk/data.py` checks for literal `../` sequences but fails to account for...

1 affected package

nltk

Package 26.04 LTS 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
nltk Needs evaluation Needs evaluation Needs evaluation Needs evaluation Needs evaluation
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CVE-2026-54293

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. Prior to 3.10.0-rc1, nltk.data.load() in NLTK is vulnerable to...

1 affected package

nltk

Package 26.04 LTS 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
nltk Needs evaluation Needs evaluation Needs evaluation Needs evaluation Needs evaluation
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CVE-2026-12199

Medium priority
Needs evaluation

A vulnerability in `nltk.app.wordnet_app` up to version 3.9.3 allows unauthenticated remote shutdown of the local WordNet Browser HTTP server when started in its default mode. The server listens on all interfaces and processes a...

1 affected package

nltk

Package 26.04 LTS 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
nltk Needs evaluation Needs evaluation Needs evaluation Needs evaluation Needs evaluation
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CVE-2026-33236

Medium priority

Some fixes available 6 of 8

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 26.04 LTS 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
nltk Fixed Fixed Fixed Fixed Fixed
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CVE-2026-33231

Medium priority

Some fixes available 6 of 8

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 26.04 LTS 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
nltk Fixed Fixed Fixed Fixed Fixed
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CVE-2026-33230

Medium priority

Some fixes available 6 of 8

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 26.04 LTS 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
nltk Fixed Fixed Fixed Fixed Fixed
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CVE-2026-0846

Medium priority

Some fixes available 6 of 8

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 26.04 LTS 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
nltk Fixed Fixed Fixed Fixed Fixed
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CVE-2026-0848

Medium priority

Some fixes available 5 of 7

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 26.04 LTS 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
nltk Fixed Fixed Fixed Fixed Fixed
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CVE-2026-0847

Medium priority

Some fixes available 6 of 8

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 26.04 LTS 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
nltk Fixed Fixed Fixed Fixed Fixed
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CVE-2025-14009

High priority

Some fixes available 7 of 8

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 26.04 LTS 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
nltk Fixed Fixed Fixed Fixed Fixed
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