Vulnerability index

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Nltk HIGH 7.8
CVE-2025-71408

NLTK (Natural Language Toolkit) before version 3.9.3 contains an eval injection vulnerability in the nltk.collocations module that allows an attacker…

Fix: 3.9.3+
Fix from $1,950 2026-07-24
Nltk HIGH 7.8
CVE-2026-12252

In nltk/nltk versions 3.9.3 and earlier, five Stanford interface classes (StanfordPOSTagger, StanfordNERTagger, StanfordParser, StanfordDependencyPar…

Fix: after 3.9.3
Fix from $1,950 2026-07-04
Nltk HIGH 7.5
CVE-2026-12243

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 `n…

No fix yet
Fix from $1,950 2026-06-30
Nltk HIGH 7.5
CVE-2026-54293

NLTK (Natural Language Toolkit) is a suite of open source Python modules, data sets, and tutorials supporting research and development in Natural Lan…

Fix: 3.10.0+
Fix from $1,950 2026-06-22
Nltk HIGH 8.1
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 Lan…

Fix: after 3.9.3
Fix from $1,950 2026-03-20
Nltk HIGH 7.5
CVE-2026-33231

NLTK (Natural Language Toolkit) is a suite of open source Python modules, data sets, and tutorials supporting research and development in Natural Lan…

Fix: after 3.9.3
Fix from $1,950 2026-03-20
Nltk MEDIUM 6.1
CVE-2026-33230

NLTK (Natural Language Toolkit) is a suite of open source Python modules, data sets, and tutorials supporting research and development in Natural Lan…

Fix: after 3.9.3
Fix from $1,600 2026-03-20
Nltk HIGH 7.5
CVE-2026-0846

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 …

No fix yet
Fix from $1,950 2026-03-09
Nltk CRITICAL 10.0
CVE-2026-0848

NLTK versions <=3.9.2 are vulnerable to arbitrary code execution due to improper input validation in the StanfordSegmenter module. The module dynamic…

Fix: after 3.9.2
Fix from $2,300 2026-03-05
Nltk HIGH 7.5
CVE-2026-0847

A vulnerability in NLTK versions up to and including 3.9.2 allows arbitrary file read via path traversal in multiple CorpusReader classes, including …

Fix: after 3.9.2
Fix from $1,950 2026-03-04
Nltk HIGH 8.8
CVE-2025-14009

A critical vulnerability exists in the NLTK downloader component of nltk/nltk, affecting all versions. The _unzip_iter function in nltk/downloader.py…

Fix: 3.9.3+
Fix from $1,950 2026-02-18
Nltk HIGH 7.5
CVE-2021-43854

NLTK (Natural Language Toolkit) is a suite of open source Python modules, data sets, and tutorials supporting research and development in Natural Lan…

Fix: 3.6.5+
Fix from $1,950 2021-12-23
Nltk HIGH 7.5
CVE-2021-3828

nltk is vulnerable to Inefficient Regular Expression Complexity

Fix: after 3.6.3
Fix from $1,950 2021-09-27
Nltk HIGH 7.5
CVE-2019-14751EPSS 6%

NLTK Downloader before 3.4.5 is vulnerable to a directory traversal, allowing attackers to write arbitrary files via a ../ (dot dot slash) in an NLTK…

Fix: 3.4.5+
Fix from $1,950 2019-08-22