{"id":"UBUNTU-CVE-2026-59849","details":"A flaw was found in libssh. Logic errors in automatic certificate-based public key authentication can cause libssh clients to loop indefinitely when configured certificates are missing or repeatedly rejected by a server, leading to denial of service.","modified":"2026-08-31T17:16:50.726002299Z","published":"2026-07-21T15:16:00Z","related":["USN-8699-1"],"upstream":["CVE-2026-59849"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-59849"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-59849"},{"type":"REPORT","url":"https://www.libssh.org/2026/07/21/libssh-0-12-1-and-0-11-5-security-releases/"},{"type":"REPORT","url":"https://www.libssh.org/security/advisories/CVE-2026-59849.txt"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-8699-1"}],"affected":[{"package":{"name":"libssh","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/libssh?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.11.3-1ubuntu2.1"}]}],"versions":["0.11.2-1build1","0.11.3-1","0.11.3-1ubuntu1","0.11.3-1ubuntu2"],"ecosystem_specific":{"binaries":[{"binary_name":"libssh-4","binary_version":"0.11.3-1ubuntu2.1"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-59849.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"Ubuntu","score":"medium"}]}