{"id":"USN-3138-1","summary":"python-cryptography vulnerability","details":"Markus Döring discovered that python-cryptography incorrectly handled\ncertain HKDF lengths. This could result in python-cryptography returning an\nempty string instead of the expected derived key.\n","modified":"2026-02-10T04:41:03Z","published":"2016-11-28T19:31:42Z","related":["UBUNTU-CVE-2016-9243"],"upstream":["CVE-2016-9243","UBUNTU-CVE-2016-9243"],"references":[{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-3138-1"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2016-9243"}],"affected":[{"package":{"name":"python-cryptography","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/python-cryptography@1.2.3-1ubuntu0.1?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.2.3-1ubuntu0.1"}]}],"versions":["1.0.1-1ubuntu1","1.0.2-1","1.1-1","1.1.1-1","1.1.1-1ubuntu1","1.1.1-1ubuntu2","1.1.1-1ubuntu3","1.2.2-2","1.2.3-1"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_name":"python-cryptography","binary_version":"1.2.3-1ubuntu0.1"},{"binary_name":"python3-cryptography","binary_version":"1.2.3-1ubuntu0.1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-3138-1.json","cves_map":{"cves":[{"severity":[{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","type":"CVSS_V3"},{"score":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}],"id":"CVE-2016-9243"}],"ecosystem":"Ubuntu:16.04:LTS"}}}],"schema_version":"1.7.3"}