{"id":"UBUNTU-CVE-2016-9243","details":"HKDF in cryptography before 1.5.2 returns an empty byte-string if used with a length less than algorithm.digest_size.","modified":"2026-02-04T04:36:54.860529Z","published":"2016-11-09T00:00:00Z","related":["USN-3138-1"],"upstream":["CVE-2016-9243"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2016-9243"},{"type":"REPORT","url":"http://www.openwall.com/lists/oss-security/2016/11/08/6"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-3138-1"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=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_version":"1.2.3-1ubuntu0.1","binary_name":"python-cryptography"},{"binary_version":"1.2.3-1ubuntu0.1","binary_name":"python3-cryptography"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2016/UBUNTU-CVE-2016-9243.json"}}],"schema_version":"1.7.3","severity":[{"type":"CVSS_V3","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":"Ubuntu","score":"medium"}]}