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CVE-2026-12261

Medium priority
Needs evaluation

A vulnerability in `nltk.downloader` in nltk/nltk versions <= 3.9.4 allows for cross-package resource and model poisoning. The downloader extracts package archives into shared namespaces such as `corpora/` and `taggers/` instead...

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-2026-12259

Medium priority
Needs evaluation

In nltk version 3.9.4, the `nltk.downloader.Downloader._download_package()` function writes downloaded package bytes to disk and may extract them before enforcing SHA-256 or MD5 checksum validation. This allows an attacker 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-2025-71408

Medium priority
Needs evaluation

NLTK (Natural Language Toolkit) before version 3.9.3 contains an eval injection vulnerability in the nltk.collocations module that allows an attacker who controls command-line arguments to execute arbitrary Python code. When...

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-2026-12252

Medium priority
Needs evaluation

In nltk/nltk versions 3.9.3 and earlier, five Stanford interface classes (StanfordPOSTagger, StanfordNERTagger, StanfordParser, StanfordDependencyParser, and StanfordNeuralDependencyParser) are vulnerable to untrusted JAR code...

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-2026-12243

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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