Vulnerability DatabaseCVE-2019-14751
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CVE-2019-14751
Published:August 22, 2019
Updated:May 17, 2026
NLTK Downloader before 3.4.5 is vulnerable to a directory traversal, allowing attackers to write arbitrary files via a ../ (dot dot slash) in an NLTK package (ZIP archive) that is mishandled during extraction.
Affected Packages
nltk (PYTHON):
Affected version(s) >=0.8 <3.4.5
Fix Suggestion:
Update to version 3.4.5
Related Resources (17)
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZGZSSEJH7RHH3RBUEVWWYT75QU67J7SE/
https://github.com/mssalvatore/CVE-2019-14751_PoC
https://github.com/pypa/advisory-database/tree/main/vulns/nltk/PYSEC-2019-106.yaml
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ZGZSSEJH7RHH3RBUEVWWYT75QU67J7SE
https://github.com/nltk/nltk
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QI4IJGLZQ5S7C5LNRNROHAO2P526XE3D/
https://github.com/nltk/nltk/commit/f59d7ed8df2e0e957f7f247fe218032abdbe9a10
https://github.com/nltk/nltk/blob/3.4.5/ChangeLog
https://github.com/advisories/GHSA-mr7p-25v2-35wr
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/QI4IJGLZQ5S7C5LNRNROHAO2P526XE3D/
https://salvatoresecurity.com/zip-slip-in-nltk-cve-2019-14751
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/QI4IJGLZQ5S7C5LNRNROHAO2P526XE3D
http://lists.opensuse.org/opensuse-security-announce/2020-03/msg00054.html
https://nvd.nist.gov/vuln/detail/CVE-2019-14751
http://lists.opensuse.org/opensuse-security-announce/2020-04/msg00001.html
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ZGZSSEJH7RHH3RBUEVWWYT75QU67J7SE/
https://salvatoresecurity.com/zip-slip-in-nltk-cve-2019-14751/
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CVSS v4
Base Score:
8.7
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
HIGH
Vulnerable System Availability
NONE
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
7.5
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
HIGH
Availability
NONE
Weakness Type (CWE)
Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
CWE-22
EPSS
Base Score:
3.22