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16 vulnerabilities found for nltk/nltk by nltk
CVE-2026-12243 (GCVE-0-2026-12243)
Vulnerability from nvd – Published: 2026-06-30 00:14 – Updated: 2026-06-30 13:14
VLAI
Title
Path Traversal via Percent-Encoding in nltk.data.find() and nltk.data.load()
Summary
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 percent-encoded traversal sequences such as `..%2f`. The `url2pathname()` function decodes these sequences after the validation step, allowing an attacker to bypass the protection. This vulnerability enables an attacker to read arbitrary files accessible to the Python process by controlling the resource name parameter passed to `nltk.data.load()` or `nltk.data.find()`. The issue affects applications that rely on NLTK for resource loading, including NLP web applications, Jupyter notebooks, and CLI tools. The default `pathsec.ENFORCE=False` setting exacerbates the impact by not blocking the file read at the `open()` stage.
Severity
7.5 (High)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Assigner
References
1 reference
Impacted products
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CVE-2026-12199 (GCVE-0-2026-12199)
Vulnerability from nvd – Published: 2026-06-17 07:13 – Updated: 2026-06-17 14:21
VLAI
Title
Unauthenticated Denial of Service in nltk.app.wordnet_app
Summary
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 specific unauthenticated GET request (`/SHUTDOWN%20THE%20SERVER`) to terminate the process immediately via `os._exit(0)`. This results in a denial of service, impacting service availability. The issue arises due to insufficient authentication and protection mechanisms for critical server functions.
Severity
7.5 (High)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-306 - Missing Authentication for Critical Function
Assigner
References
1 reference
Impacted products
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CVE-2026-0846 (GCVE-0-2026-0846)
Vulnerability from nvd – Published: 2026-03-09 19:19 – Updated: 2026-06-30 12:07
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)
7.5 (High)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
Assigner
References
6 references
| URL | Tags |
|---|---|
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| https://bugzilla.redhat.com/show_bug.cgi?id=2445826 | issue-trackingx_refsource_REDHAT |
| https://security.access.redhat.com/data/csaf/v2/v… | x_sadp-csaf-vex |
| https://access.redhat.com/errata/RHSA-2026:10184 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:19712 | vendor-advisoryx_refsource_REDHAT |
Impacted products
7 products
| Vendor | Product | Version | |
|---|---|---|---|
| nltk | nltk/nltk |
Affected:
unspecified , ≤ latest
(custom)
|
|
| Red Hat | Red Hat OpenShift AI 2.25 |
cpe:/a:redhat:openshift_ai:2.25::el9 |
|
| Red Hat | Red Hat OpenShift AI 3.3 |
cpe:/a:redhat:openshift_ai:3.3::el9 |
|
| Red Hat | Lightspeed Core |
cpe:/a:redhat:lightspeed_core |
|
| Red Hat | OpenShift Lightspeed |
cpe:/a:redhat:openshift_lightspeed |
|
| Red Hat | Red Hat Ansible Automation Platform 2 |
cpe:/a:redhat:ansible_automation_platform:2 |
|
| Red Hat | Red Hat OpenShift AI (RHOAI) |
cpe:/a:redhat:openshift_ai |
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CVE-2026-0848 (GCVE-0-2026-0848)
Vulnerability from nvd – 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)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-20 - Improper Input Validation
Assigner
References
1 reference
Impacted products
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CVE-2026-0847 (GCVE-0-2026-0847)
Vulnerability from nvd – Published: 2026-03-04 18:25 – Updated: 2026-06-30 12:07
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)
7.5 (High)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Assigner
References
6 references
| URL | Tags |
|---|---|
| https://huntr.com/bounties/fc69914f-36a9-4c18-850… | |
| https://access.redhat.com/security/cve/CVE-2026-0847 | vdb-entryx_refsource_REDHAT |
| https://bugzilla.redhat.com/show_bug.cgi?id=2444608 | issue-trackingx_refsource_REDHAT |
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| https://access.redhat.com/errata/RHSA-2026:19712 | vendor-advisoryx_refsource_REDHAT |
Impacted products
7 products
| Vendor | Product | Version | |
|---|---|---|---|
| nltk | nltk/nltk |
Affected:
unspecified , ≤ latest
(custom)
|
|
| Red Hat | Red Hat OpenShift AI 2.25 |
cpe:/a:redhat:openshift_ai:2.25::el9 |
|
| Red Hat | Red Hat OpenShift AI 3.3 |
cpe:/a:redhat:openshift_ai:3.3::el9 |
|
| Red Hat | Lightspeed Core |
cpe:/a:redhat:lightspeed_core |
|
| Red Hat | OpenShift Lightspeed |
cpe:/a:redhat:openshift_lightspeed |
|
| Red Hat | Red Hat Ansible Automation Platform 2 |
cpe:/a:redhat:ansible_automation_platform:2 |
|
| Red Hat | Red Hat OpenShift AI (RHOAI) |
cpe:/a:redhat:openshift_ai |
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CVE-2025-14009 (GCVE-0-2025-14009)
Vulnerability from nvd – Published: 2026-02-18 17:45 – Updated: 2026-06-30 12:07
VLAI
Title
Zip Slip Vulnerability in nltk/nltk Leading to Remote Code Execution
Summary
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Severity
10 (Critical)
8.8 (High)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://huntr.com/bounties/49ecbc02-054e-4470-b2e… | |
| https://access.redhat.com/security/cve/CVE-2025-14009 | vdb-entryx_refsource_REDHAT |
| https://bugzilla.redhat.com/show_bug.cgi?id=2440724 | issue-trackingx_refsource_REDHAT |
| https://security.access.redhat.com/data/csaf/v2/v… | x_sadp-csaf-vex |
| https://access.redhat.com/errata/RHSA-2026:10184 | vendor-advisoryx_refsource_REDHAT |
Impacted products
4 products
| Vendor | Product | Version | |
|---|---|---|---|
| nltk | nltk/nltk |
Affected:
unspecified , ≤ latest
(custom)
|
|
| Red Hat | Red Hat OpenShift AI 2.25 |
cpe:/a:redhat:openshift_ai:2.25::el9 |
|
| Red Hat | OpenShift Lightspeed |
cpe:/a:redhat:openshift_lightspeed |
|
| Red Hat | Red Hat OpenShift AI (RHOAI) |
cpe:/a:redhat:openshift_ai |
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CVE-2021-3842 (GCVE-0-2021-3842)
Vulnerability from nvd – 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
References
2 references
| URL | Tags |
|---|---|
| https://huntr.dev/bounties/761a761e-2be2-430a-8d9… | x_refsource_CONFIRM |
| https://github.com/nltk/nltk/commit/2a50a3edc9d35… | x_refsource_MISC |
Impacted products
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CVE-2021-3828 (GCVE-0-2021-3828)
Vulnerability from nvd – 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
2 references
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Impacted products
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CVE-2026-12243 (GCVE-0-2026-12243)
Vulnerability from cvelistv5 – Published: 2026-06-30 00:14 – Updated: 2026-06-30 13:14
VLAI
Title
Path Traversal via Percent-Encoding in nltk.data.find() and nltk.data.load()
Summary
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 percent-encoded traversal sequences such as `..%2f`. The `url2pathname()` function decodes these sequences after the validation step, allowing an attacker to bypass the protection. This vulnerability enables an attacker to read arbitrary files accessible to the Python process by controlling the resource name parameter passed to `nltk.data.load()` or `nltk.data.find()`. The issue affects applications that rely on NLTK for resource loading, including NLP web applications, Jupyter notebooks, and CLI tools. The default `pathsec.ENFORCE=False` setting exacerbates the impact by not blocking the file read at the `open()` stage.
Severity
7.5 (High)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Assigner
References
1 reference
Impacted products
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CVE-2026-12199 (GCVE-0-2026-12199)
Vulnerability from cvelistv5 – Published: 2026-06-17 07:13 – Updated: 2026-06-17 14:21
VLAI
Title
Unauthenticated Denial of Service in nltk.app.wordnet_app
Summary
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 specific unauthenticated GET request (`/SHUTDOWN%20THE%20SERVER`) to terminate the process immediately via `os._exit(0)`. This results in a denial of service, impacting service availability. The issue arises due to insufficient authentication and protection mechanisms for critical server functions.
Severity
7.5 (High)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-306 - Missing Authentication for Critical Function
Assigner
References
1 reference
Impacted products
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CVE-2026-0846 (GCVE-0-2026-0846)
Vulnerability from cvelistv5 – Published: 2026-03-09 19:19 – Updated: 2026-06-30 12:07
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)
7.5 (High)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
Assigner
References
6 references
| URL | Tags |
|---|---|
| https://huntr.com/bounties/007b84f8-418e-4300-99d… | |
| https://access.redhat.com/security/cve/CVE-2026-0846 | vdb-entryx_refsource_REDHAT |
| https://bugzilla.redhat.com/show_bug.cgi?id=2445826 | issue-trackingx_refsource_REDHAT |
| https://security.access.redhat.com/data/csaf/v2/v… | x_sadp-csaf-vex |
| https://access.redhat.com/errata/RHSA-2026:10184 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:19712 | vendor-advisoryx_refsource_REDHAT |
Impacted products
7 products
| Vendor | Product | Version | |
|---|---|---|---|
| nltk | nltk/nltk |
Affected:
unspecified , ≤ latest
(custom)
|
|
| Red Hat | Red Hat OpenShift AI 2.25 |
cpe:/a:redhat:openshift_ai:2.25::el9 |
|
| Red Hat | Red Hat OpenShift AI 3.3 |
cpe:/a:redhat:openshift_ai:3.3::el9 |
|
| Red Hat | Lightspeed Core |
cpe:/a:redhat:lightspeed_core |
|
| Red Hat | OpenShift Lightspeed |
cpe:/a:redhat:openshift_lightspeed |
|
| Red Hat | Red Hat Ansible Automation Platform 2 |
cpe:/a:redhat:ansible_automation_platform:2 |
|
| Red Hat | Red Hat OpenShift AI (RHOAI) |
cpe:/a:redhat:openshift_ai |
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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)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-20 - Improper Input Validation
Assigner
References
1 reference
Impacted products
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CVE-2026-0847 (GCVE-0-2026-0847)
Vulnerability from cvelistv5 – Published: 2026-03-04 18:25 – Updated: 2026-06-30 12:07
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)
7.5 (High)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Assigner
References
6 references
| URL | Tags |
|---|---|
| https://huntr.com/bounties/fc69914f-36a9-4c18-850… | |
| https://access.redhat.com/security/cve/CVE-2026-0847 | vdb-entryx_refsource_REDHAT |
| https://bugzilla.redhat.com/show_bug.cgi?id=2444608 | issue-trackingx_refsource_REDHAT |
| https://security.access.redhat.com/data/csaf/v2/v… | x_sadp-csaf-vex |
| https://access.redhat.com/errata/RHSA-2026:10184 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:19712 | vendor-advisoryx_refsource_REDHAT |
Impacted products
7 products
| Vendor | Product | Version | |
|---|---|---|---|
| nltk | nltk/nltk |
Affected:
unspecified , ≤ latest
(custom)
|
|
| Red Hat | Red Hat OpenShift AI 2.25 |
cpe:/a:redhat:openshift_ai:2.25::el9 |
|
| Red Hat | Red Hat OpenShift AI 3.3 |
cpe:/a:redhat:openshift_ai:3.3::el9 |
|
| Red Hat | Lightspeed Core |
cpe:/a:redhat:lightspeed_core |
|
| Red Hat | OpenShift Lightspeed |
cpe:/a:redhat:openshift_lightspeed |
|
| Red Hat | Red Hat Ansible Automation Platform 2 |
cpe:/a:redhat:ansible_automation_platform:2 |
|
| Red Hat | Red Hat OpenShift AI (RHOAI) |
cpe:/a:redhat:openshift_ai |
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CVE-2025-14009 (GCVE-0-2025-14009)
Vulnerability from cvelistv5 – Published: 2026-02-18 17:45 – Updated: 2026-06-30 12:07
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)
8.8 (High)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://huntr.com/bounties/49ecbc02-054e-4470-b2e… | |
| https://access.redhat.com/security/cve/CVE-2025-14009 | vdb-entryx_refsource_REDHAT |
| https://bugzilla.redhat.com/show_bug.cgi?id=2440724 | issue-trackingx_refsource_REDHAT |
| https://security.access.redhat.com/data/csaf/v2/v… | x_sadp-csaf-vex |
| https://access.redhat.com/errata/RHSA-2026:10184 | vendor-advisoryx_refsource_REDHAT |
Impacted products
4 products
| Vendor | Product | Version | |
|---|---|---|---|
| nltk | nltk/nltk |
Affected:
unspecified , ≤ latest
(custom)
|
|
| Red Hat | Red Hat OpenShift AI 2.25 |
cpe:/a:redhat:openshift_ai:2.25::el9 |
|
| Red Hat | OpenShift Lightspeed |
cpe:/a:redhat:openshift_lightspeed |
|
| Red Hat | Red Hat OpenShift AI (RHOAI) |
cpe:/a:redhat:openshift_ai |
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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
References
2 references
| URL | Tags |
|---|---|
| https://huntr.dev/bounties/761a761e-2be2-430a-8d9… | x_refsource_CONFIRM |
| https://github.com/nltk/nltk/commit/2a50a3edc9d35… | x_refsource_MISC |
Impacted products
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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
2 references
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|---|---|
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| https://github.com/nltk/nltk/commit/277711ab1dec7… | x_refsource_MISC |
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