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Vulnerability Details :

CVE-2025-14009

Summary
Assigner-@huntr_ai
Assigner Org ID-c09c270a-b464-47c1-9133-acb35b22c19a
Published At-18 Feb, 2026 | 17:45
Updated At-18 Feb, 2026 | 19:10
Rejected At-
Credits

Zip Slip Vulnerability in nltk/nltk Leading to Remote Code Execution

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.

Vendors
-
Not available
Products
-
Metrics (CVSS)
VersionBase scoreBase severityVector
Weaknesses
Attack Patterns
Solution/Workaround
References
HyperlinkResource Type
EPSS History
Score
Latest Score
-
N/A
No data available for selected date range
Percentile
Latest Percentile
-
N/A
No data available for selected date range
Stakeholder-Specific Vulnerability Categorization (SSVC)
â–¼Common Vulnerabilities and Exposures (CVE)
cve.org
Assigner:@huntr_ai
Assigner Org ID:c09c270a-b464-47c1-9133-acb35b22c19a
Published At:18 Feb, 2026 | 17:45
Updated At:18 Feb, 2026 | 19:10
Rejected At:
â–¼CVE Numbering Authority (CNA)
Zip Slip Vulnerability in nltk/nltk Leading to Remote Code Execution

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.

Affected Products
Vendor
nltk
Product
nltk/nltk
Versions
Affected
  • From unspecified through latest (custom)
Problem Types
TypeCWE IDDescription
CWECWE-94CWE-94 Improper Control of Generation of Code
Type: CWE
CWE ID: CWE-94
Description: CWE-94 Improper Control of Generation of Code
Metrics
VersionBase scoreBase severityVector
3.010.0CRITICAL
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Version: 3.0
Base score: 10.0
Base severity: CRITICAL
Vector:
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
https://huntr.com/bounties/49ecbc02-054e-4470-b2e0-b267936cc4e4
N/A
Hyperlink: https://huntr.com/bounties/49ecbc02-054e-4470-b2e0-b267936cc4e4
Resource: N/A
â–¼Authorized Data Publishers (ADP)
CISA ADP Vulnrichment
Affected Products
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
https://huntr.com/bounties/49ecbc02-054e-4470-b2e0-b267936cc4e4
exploit
Hyperlink: https://huntr.com/bounties/49ecbc02-054e-4470-b2e0-b267936cc4e4
Resource:
exploit
Information is not available yet
â–¼National Vulnerability Database (NVD)
nvd.nist.gov
Source:security@huntr.dev
Published At:18 Feb, 2026 | 18:24
Updated At:18 Feb, 2026 | 20:18

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.

CISA Catalog
Date AddedDue DateVulnerability NameRequired Action
N/A
Date Added: N/A
Due Date: N/A
Vulnerability Name: N/A
Required Action: N/A
Metrics
TypeVersionBase scoreBase severityVector
Secondary3.010.0CRITICAL
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Type: Secondary
Version: 3.0
Base score: 10.0
Base severity: CRITICAL
Vector:
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
CPE Matches
Weaknesses
CWE IDTypeSource
CWE-94Secondarysecurity@huntr.dev
CWE ID: CWE-94
Type: Secondary
Source: security@huntr.dev
Evaluator Description
Evaluator Impact

Evaluator Solution

Vendor Statements
References
HyperlinkSourceResource
https://huntr.com/bounties/49ecbc02-054e-4470-b2e0-b267936cc4e4security@huntr.dev
N/A
https://huntr.com/bounties/49ecbc02-054e-4470-b2e0-b267936cc4e4134c704f-9b21-4f2e-91b3-4a467353bcc0
N/A
Hyperlink: https://huntr.com/bounties/49ecbc02-054e-4470-b2e0-b267936cc4e4
Source: security@huntr.dev
Resource: N/A
Hyperlink: https://huntr.com/bounties/49ecbc02-054e-4470-b2e0-b267936cc4e4
Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0
Resource: N/A

Change History

0
Information is not available yet

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