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NVD Vulnerability Details :
CVE-2025-14009
Received
More InfoOfficial Page
Source-security@huntr.dev
View Known Exploited Vulnerability (KEV) details
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
0Changes found

Details not found