CVE-2019-14751

high

Description

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.

References

Advisories
More

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZGZSSEJH7RHH3RBUEVWWYT75QU67J7SE/

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QI4IJGLZQ5S7C5LNRNROHAO2P526XE3D/

http://lists.opensuse.org/opensuse-security-announce/2020-04/msg00001.html

http://lists.opensuse.org/opensuse-security-announce/2020-03/msg00054.html

https://github.com/advisories/GHSA-mr7p-25v2-35wr

https://salvatoresecurity.com/zip-slip-in-nltk-cve-2019-14751/

https://github.com/nltk/nltk/commit/f59d7ed8df2e0e957f7f247fe218032abdbe9a10

https://github.com/nltk/nltk/blob/3.4.5/ChangeLog

https://github.com/mssalvatore/CVE-2019-14751_PoC

https://euvd.enisa.europa.eu/vulnerability/EUVD-2019-0091

Details

Source: Mitre, NVD

Published: 2019-08-22

Updated: 2026-06-17

Risk Information

CVSS v2

Base Score: 5

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:P/A:N

Severity: Medium

CVSS v3

Base Score: 7.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Severity: High

CVSS v4

Base Score: 8.7

Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N