{"id":"UBUNTU-CVE-2019-20397","details":"A double-free is present in libyang before v1.0-r1 in the function yyparse() when an organization field is not terminated. Applications that use libyang to parse untrusted input yang files may be vulnerable to this flaw, which would cause a crash or potentially code execution.","modified":"2026-04-22T12:17:30.487573Z","published":"2020-01-22T22:15:00Z","upstream":["CVE-2019-20397"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2019-20397"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=1793928"},{"type":"REPORT","url":"https://github.com/CESNET/libyang/commit/88bd6c548ba79bce176cd875e9b56e7e0ef4d8d4"},{"type":"REPORT","url":"https://github.com/CESNET/libyang/issues/739"},{"type":"REPORT","url":"https://github.com/CESNET/libyang/compare/v0.16-r3...v1.0-r1"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2019-20397"}],"affected":[{"package":{"name":"libyang","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/libyang@0.16.105-3build1?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.16.105-1","0.16.105-2","0.16.105-3","0.16.105-3build1"],"ecosystem_specific":{"binaries":[{"binary_name":"libyang-cpp0.16","binary_version":"0.16.105-3build1"},{"binary_name":"libyang0.16","binary_version":"0.16.105-3build1"},{"binary_name":"python3-yang","binary_version":"0.16.105-3build1"},{"binary_name":"yang-tools","binary_version":"0.16.105-3build1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2019/UBUNTU-CVE-2019-20397.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"},{"type":"Ubuntu","score":"medium"}]}