{"id":"UBUNTU-CVE-2019-14751","details":"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.","modified":"2026-01-30T02:01:17.329180Z","published":"2019-08-20T00:00:00Z","related":["USN-4106-1"],"upstream":["CVE-2019-14751"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2019-14751"},{"type":"REPORT","url":"https://github.com/nltk/nltk/blob/3.4.5/ChangeLog"},{"type":"REPORT","url":"https://salvatoresecurity.com/zip-slip-in-nltk-cve-2019-14751/"},{"type":"REPORT","url":"https://github.com/mssalvatore/CVE-2019-14751_PoC"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-4106-1"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2019-14751"}],"affected":[{"package":{"name":"nltk","ecosystem":"Ubuntu:Pro:14.04:LTS","purl":"pkg:deb/ubuntu/nltk@2.0~b9-0ubuntu4.1~esm2?arch=source&distro=trusty/esm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.0~b9-0ubuntu4.1~esm2"}]}],"versions":["2.0~b9-0ubuntu4"],"ecosystem_specific":{"binaries":[{"binary_name":"python-nltk","binary_version":"2.0~b9-0ubuntu4.1~esm2"}],"availability":"Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2019/UBUNTU-CVE-2019-14751.json"}},{"package":{"name":"nltk","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/nltk@3.1-1ubuntu0.1?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.1-1ubuntu0.1"}]}],"versions":["3.0.4-1","3.0.5-1","3.1-1"],"ecosystem_specific":{"binaries":[{"binary_name":"python-nltk","binary_version":"3.1-1ubuntu0.1"},{"binary_name":"python3-nltk","binary_version":"3.1-1ubuntu0.1"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2019/UBUNTU-CVE-2019-14751.json"}},{"package":{"name":"nltk","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/nltk@3.2.5-1ubuntu0.1?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.2.5-1ubuntu0.1"}]}],"versions":["3.2.4-1","3.2.5-1"],"ecosystem_specific":{"binaries":[{"binary_name":"python-nltk","binary_version":"3.2.5-1ubuntu0.1"},{"binary_name":"python3-nltk","binary_version":"3.2.5-1ubuntu0.1"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2019/UBUNTU-CVE-2019-14751.json"}}],"schema_version":"1.7.3","severity":[{"type":"CVSS_V3","score":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N"},{"type":"Ubuntu","score":"medium"}]}