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11 vulnerabilities by nltk
CVE-2026-33236 (GCVE-0-2026-33236)
Vulnerability from cvelistv5 – Published: 2026-03-20 22:47 – Updated: 2026-03-23 16:46
VLAI?
Title
NLTK has a Downloader Path Traversal Vulnerability (AFO) - Arbitrary File Overwrite
Summary
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 `subdir` and `id` 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.
Severity ?
8.1 (High)
CWE
- CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Assigner
References
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CVE-2026-33231 (GCVE-0-2026-33231)
Vulnerability from cvelistv5 – Published: 2026-03-20 22:45 – Updated: 2026-03-25 13:43
VLAI?
Title
NLTK has unauthenticated remote shutdown in nltk.app.wordnet_app
Summary
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 unauthenticated remote shutdown of the local WordNet Browser HTTP server when it is started in its default mode. A simple `GET /SHUTDOWN%20THE%20SERVER` request causes the process to terminate immediately via `os._exit(0)`, resulting in a denial of service. Commit bbaae83db86a0f49e00f5b0db44a7254c268de9b patches the issue.
Severity ?
7.5 (High)
CWE
- CWE-306 - Missing Authentication for Critical Function
Assigner
References
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CVE-2026-33230 (GCVE-0-2026-33230)
Vulnerability from cvelistv5 – Published: 2026-03-20 22:43 – Updated: 2026-03-24 02:07
VLAI?
Title
nltk Vulnerable to Cross-site Scripting
Summary
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 reflected cross-site scripting issue in the `lookup_...` route. A crafted `lookup_<payload>` URL can inject arbitrary HTML/JavaScript into the response page because attacker-controlled `word` data is reflected into HTML without escaping. This impacts users running the local WordNet Browser server and can lead to script execution in the browser origin of that application. Commit 1c3f799607eeb088cab2491dcf806ae83c29ad8f fixes the issue.
Severity ?
6.1 (Medium)
CWE
- CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Assigner
References
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CVE-2026-0846 (GCVE-0-2026-0846)
Vulnerability from cvelistv5 – Published: 2026-03-09 19:19 – Updated: 2026-03-12 14:48
VLAI?
Title
Arbitrary File Read via Absolute Path Input in nltk.util.filestring()
Summary
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 sanitization, enabling attackers to access sensitive system files by providing absolute paths or traversal paths. This vulnerability can be exploited locally or remotely, particularly in scenarios where the function is used in web APIs or other interfaces that accept user-supplied input.
Severity ?
8.6 (High)
CWE
- CWE-36 - Absolute Path Traversal
Assigner
References
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CVE-2026-0848 (GCVE-0-2026-0848)
Vulnerability from cvelistv5 – Published: 2026-03-05 20:48 – Updated: 2026-03-06 16:31
VLAI?
Title
Arbitrary Code Execution in NLTK StanfordSegmenter via Untrusted JAR Loading
Summary
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 attacker can supply or replace the JAR file, enabling the execution of arbitrary Java bytecode at import time. This vulnerability can be exploited through methods such as model poisoning, MITM attacks, or dependency poisoning, leading to remote code execution. The issue arises from the direct execution of the JAR file via subprocess with unvalidated classpath input, allowing malicious classes to execute when loaded by the JVM.
Severity ?
10 (Critical)
CWE
- CWE-20 - Improper Input Validation
Assigner
References
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CVE-2026-0847 (GCVE-0-2026-0847)
Vulnerability from cvelistv5 – Published: 2026-03-04 18:25 – Updated: 2026-03-04 18:49
VLAI?
Title
Path Traversal in nltk/nltk
Summary
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 classes fail to properly sanitize or validate file paths, enabling attackers to traverse directories and access sensitive files on the server. This issue is particularly critical in scenarios where user-controlled file inputs are processed, such as in machine learning APIs, chatbots, or NLP pipelines. Exploitation of this vulnerability can lead to unauthorized access to sensitive files, including system files, SSH private keys, and API tokens, and may potentially escalate to remote code execution when combined with other vulnerabilities.
Severity ?
8.6 (High)
CWE
- CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Assigner
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CVE-2025-14009 (GCVE-0-2025-14009)
Vulnerability from cvelistv5 – Published: 2026-02-18 17:45 – Updated: 2026-02-26 14:44
VLAI?
Title
Zip Slip Vulnerability in nltk/nltk Leading to Remote Code Execution
Summary
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. This allows attackers to craft malicious zip packages that, when downloaded and extracted by NLTK, can execute arbitrary code. The vulnerability arises because NLTK assumes all downloaded packages are trusted and extracts them without validation. If a malicious package contains Python files, such as __init__.py, these files are executed automatically upon import, leading to remote code execution. This issue can result in full system compromise, including file system access, network access, and potential persistence mechanisms.
Severity ?
10 (Critical)
CWE
- CWE-94 - Improper Control of Generation of Code
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CVE-2021-3842 (GCVE-0-2021-3842)
Vulnerability from cvelistv5 – Published: 2022-01-04 14:50 – Updated: 2024-08-03 17:09
VLAI?
Title
Inefficient Regular Expression Complexity in nltk/nltk
Summary
nltk is vulnerable to Inefficient Regular Expression Complexity
Severity ?
7.5 (High)
CWE
- CWE-1333 - Inefficient Regular Expression Complexity
Assigner
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CVE-2021-43854 (GCVE-0-2021-43854)
Vulnerability from cvelistv5 – Published: 2021-12-23 17:55 – Updated: 2024-08-04 04:10
VLAI?
Title
Inefficient Regular Expression Complexity in nltk
Summary
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 denial of service (ReDoS) attacks. The vulnerability is present in PunktSentenceTokenizer, sent_tokenize and word_tokenize. Any users of this class, or these two functions, are vulnerable to the ReDoS attack. In short, a specifically crafted long input to any of these vulnerable functions will cause them to take a significant amount of execution time. If your program relies on any of the vulnerable functions for tokenizing unpredictable user input, then we would strongly recommend upgrading to a version of NLTK without the vulnerability. For users unable to upgrade the execution time can be bounded by limiting the maximum length of an input to any of the vulnerable functions. Our recommendation is to implement such a limit.
Severity ?
7.5 (High)
CWE
- CWE-400 - Uncontrolled Resource Consumption
Assigner
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CVE-2021-3828 (GCVE-0-2021-3828)
Vulnerability from cvelistv5 – Published: 2021-09-27 12:25 – Updated: 2024-08-03 17:09
VLAI?
Title
Inefficient Regular Expression Complexity in nltk/nltk
Summary
nltk is vulnerable to Inefficient Regular Expression Complexity
Severity ?
7.5 (High)
CWE
- CWE-1333 - Inefficient Regular Expression Complexity
Assigner
References
| URL | Tags | |||||||
|---|---|---|---|---|---|---|---|---|
|
||||||||
Credits
Srikanth Prathi (@srikanthprathi)
Tom Aarsen (@tomaarsen)
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CVE-2019-14751 (GCVE-0-2019-14751)
Vulnerability from cvelistv5 – Published: 2019-08-22 15:59 – Updated: 2024-08-05 00:26
VLAI?
Summary
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 package (ZIP archive) that is mishandled during extraction.
Severity ?
No CVSS data available.
CWE
- n/a
Assigner
References
| URL | Tags | |||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
||||||||||||||||||||||||||
Date Public ?
2019-08-20 00:00
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