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.
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.
In nltk prior to 3.8.1, a user who visits a malicious link with wordnet browser open will execute code on system. This may lead to RCE by inducing user to visit a link.
Natural Language Toolkit
Library home page: https://files.pythonhosted.org/packages/5e/37/9532ddd4b1bbb619333d5708aaad9bf1742f051a664c3c6fa6632a105fd8/nltk-3.6.2-py3-none-any.whl
Found in HEAD commit: 746ed83ebdd8ae6f3a8cc4520617776b5d61397e
Vulnerabilities
**In some cases, Remediation PR cannot be created automatically for a vulnerability despite the availability of remediation
Details
CVE-2024-39705
### Vulnerable Library - nltk-3.6.2-py3-none-any.whlNatural Language Toolkit
Library home page: https://files.pythonhosted.org/packages/5e/37/9532ddd4b1bbb619333d5708aaad9bf1742f051a664c3c6fa6632a105fd8/nltk-3.6.2-py3-none-any.whl
Dependency Hierarchy: - :x: **nltk-3.6.2-py3-none-any.whl** (Vulnerable Library)
Found in HEAD commit: 746ed83ebdd8ae6f3a8cc4520617776b5d61397e
Found in base branch: master
### Vulnerability DetailsNLTK 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.
Publish Date: 2024-06-27
URL: CVE-2024-39705
### CVSS 3 Score Details (9.8)Base Score Metrics: - Exploitability Metrics: - Attack Vector: Network - Attack Complexity: Low - Privileges Required: None - User Interaction: None - Scope: Unchanged - Impact Metrics: - Confidentiality Impact: High - Integrity Impact: High - Availability Impact: High
For more information on CVSS3 Scores, click here. ### Suggested FixType: Upgrade version
Origin: https://nvd.nist.gov/vuln/detail/CVE-2024-39705
Release Date: 2024-06-27
Fix Resolution: nltk - 3.8,3.3.0
CVE-2021-43854
### Vulnerable Library - nltk-3.6.2-py3-none-any.whlNatural Language Toolkit
Library home page: https://files.pythonhosted.org/packages/5e/37/9532ddd4b1bbb619333d5708aaad9bf1742f051a664c3c6fa6632a105fd8/nltk-3.6.2-py3-none-any.whl
Dependency Hierarchy: - :x: **nltk-3.6.2-py3-none-any.whl** (Vulnerable Library)
Found in HEAD commit: 746ed83ebdd8ae6f3a8cc4520617776b5d61397e
Found in base branch: master
### Vulnerability DetailsNLTK (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.
Publish Date: 2021-12-23
URL: CVE-2021-43854
### CVSS 3 Score Details (7.5)Base Score Metrics: - Exploitability Metrics: - Attack Vector: Network - Attack Complexity: Low - Privileges Required: None - User Interaction: None - Scope: Unchanged - Impact Metrics: - Confidentiality Impact: None - Integrity Impact: None - Availability Impact: High
For more information on CVSS3 Scores, click here. ### Suggested FixType: Upgrade version
Origin: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-43854
Release Date: 2021-12-23
Fix Resolution: 3.6.6
CVE-2021-3842
### Vulnerable Library - nltk-3.6.2-py3-none-any.whlNatural Language Toolkit
Library home page: https://files.pythonhosted.org/packages/5e/37/9532ddd4b1bbb619333d5708aaad9bf1742f051a664c3c6fa6632a105fd8/nltk-3.6.2-py3-none-any.whl
Dependency Hierarchy: - :x: **nltk-3.6.2-py3-none-any.whl** (Vulnerable Library)
Found in HEAD commit: 746ed83ebdd8ae6f3a8cc4520617776b5d61397e
Found in base branch: master
### Vulnerability Detailsnltk is vulnerable to Inefficient Regular Expression Complexity
Publish Date: 2022-01-04
URL: CVE-2021-3842
### CVSS 3 Score Details (7.5)Base Score Metrics: - Exploitability Metrics: - Attack Vector: Network - Attack Complexity: Low - Privileges Required: None - User Interaction: None - Scope: Unchanged - Impact Metrics: - Confidentiality Impact: None - Integrity Impact: None - Availability Impact: High
For more information on CVSS3 Scores, click here. ### Suggested FixType: Upgrade version
Origin: https://github.com/nltk/nltk/security/advisories/GHSA-f8m6-h2c7-8h9x
Release Date: 2022-01-04
Fix Resolution: 3.6.6
CVE-2021-3828
### Vulnerable Library - nltk-3.6.2-py3-none-any.whlNatural Language Toolkit
Library home page: https://files.pythonhosted.org/packages/5e/37/9532ddd4b1bbb619333d5708aaad9bf1742f051a664c3c6fa6632a105fd8/nltk-3.6.2-py3-none-any.whl
Dependency Hierarchy: - :x: **nltk-3.6.2-py3-none-any.whl** (Vulnerable Library)
Found in HEAD commit: 746ed83ebdd8ae6f3a8cc4520617776b5d61397e
Found in base branch: master
### Vulnerability Detailsnltk is vulnerable to Inefficient Regular Expression Complexity
Publish Date: 2021-09-27
URL: CVE-2021-3828
### CVSS 3 Score Details (7.5)Base Score Metrics: - Exploitability Metrics: - Attack Vector: Network - Attack Complexity: Low - Privileges Required: None - User Interaction: None - Scope: Unchanged - Impact Metrics: - Confidentiality Impact: None - Integrity Impact: None - Availability Impact: High
For more information on CVSS3 Scores, click here. ### Suggested FixType: Upgrade version
Origin: https://nvd.nist.gov/vuln/detail/CVE-2021-3828
Release Date: 2021-09-27
Fix Resolution: 3.6.4
WS-2022-0437
### Vulnerable Library - nltk-3.6.2-py3-none-any.whlNatural Language Toolkit
Library home page: https://files.pythonhosted.org/packages/5e/37/9532ddd4b1bbb619333d5708aaad9bf1742f051a664c3c6fa6632a105fd8/nltk-3.6.2-py3-none-any.whl
Dependency Hierarchy: - :x: **nltk-3.6.2-py3-none-any.whl** (Vulnerable Library)
Found in HEAD commit: 746ed83ebdd8ae6f3a8cc4520617776b5d61397e
Found in base branch: master
### Vulnerability DetailsIn nltk/nltk, a reflected XSS can be achieved by simply creating a URL, which leads to browser hijacking, and sensitive information loss.
Publish Date: 2022-12-23
URL: WS-2022-0437
### CVSS 3 Score Details (6.1)Base Score Metrics: - Exploitability Metrics: - Attack Vector: Network - Attack Complexity: Low - Privileges Required: None - User Interaction: Required - Scope: Changed - Impact Metrics: - Confidentiality Impact: Low - Integrity Impact: Low - Availability Impact: None
For more information on CVSS3 Scores, click here. ### Suggested FixType: Upgrade version
Origin: https://huntr.dev/bounties/861a8d11-0fe9-4c2f-9112-af3a9559fa87/
Release Date: 2022-12-23
Fix Resolution: 3.8.1
WS-2022-0438
### Vulnerable Library - nltk-3.6.2-py3-none-any.whlNatural Language Toolkit
Library home page: https://files.pythonhosted.org/packages/5e/37/9532ddd4b1bbb619333d5708aaad9bf1742f051a664c3c6fa6632a105fd8/nltk-3.6.2-py3-none-any.whl
Dependency Hierarchy: - :x: **nltk-3.6.2-py3-none-any.whl** (Vulnerable Library)
Found in HEAD commit: 746ed83ebdd8ae6f3a8cc4520617776b5d61397e
Found in base branch: master
### Vulnerability DetailsIn nltk prior to 3.8.1, a user who visits a malicious link with wordnet browser open will execute code on system. This may lead to RCE by inducing user to visit a link.
Publish Date: 2022-12-29
URL: WS-2022-0438
### CVSS 3 Score Details (5.0)Base Score Metrics: - Exploitability Metrics: - Attack Vector: Network - Attack Complexity: High - Privileges Required: None - User Interaction: Required - Scope: Unchanged - Impact Metrics: - Confidentiality Impact: Low - Integrity Impact: Low - Availability Impact: Low
For more information on CVSS3 Scores, click here. ### Suggested FixType: Upgrade version
Origin: https://huntr.dev/bounties/cd3957f0-2c9c-416d-bc3a-190a5b7ce4a6/
Release Date: 2022-12-29
Fix Resolution: 3.8.1