Python
CVE-2025-14009
HIGH
GHSA-7p94-766c-hgjp
Severity by source
AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Network-delivered malicious package with low complexity and total impact, but the victim must initiate the download/extract, so UI:R and PR:N rather than the vendor's PR:L/UI:N.
Primary rating from Vendor (huntr).
CVSS VectorVendor: huntr
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
11Blast Radius
ecosystem impact- 9 pypi packages depend on nltk (9 direct, 0 indirect)
Ecosystem-wide dependent count for version 3.9.3.
DescriptionCVE.org
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.
AnalysisAI
Arbitrary code execution in the NLTK (Natural Language Toolkit) Python library affects all versions through its data downloader: the _unzip_iter function in nltk/downloader.py calls zipfile.extractall() with no path validation, so a malicious data package can drop attacker-controlled Python files (e.g. __init__.py) that execute automatically on import. Any application that downloads NLTK data from an attacker-influenced source is exposed to full remote code execution. Publicly available exploit code exists (huntr.com bounty), EPSS is modest at 0.57% (68th percentile), and there is no public exploit identified as actively exploited in CISA KEV.
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View allVendor StatusVendor
SUSE
| Product | Status |
|---|---|
| SUSE Package Hub 15 SP6 | Fixed |
| openSUSE Leap 15.6 | Fixed |
| openSUSE Tumbleweed | Fixed |
| SUSE Package Hub 15 SP6 | Fixed |
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External POC / Exploit Code
Leaving vuln.today