{"id":"USN-8722-1","summary":"libssh2 vulnerabilities","details":"It was discovered that libssh2 incorrectly handled certain SFTP server\nresponses. A remote attacker controlling an SSH server could use this issue\nto cause libssh2 to crash or possibly execute arbitrary code.\n(CVE-2026-66032)\n\nIt was discovered that libssh2 incorrectly handled AES-GCM cipher\nnegotiation. A remote attacker controlling an SSH server could possibly use\nthis issue to cause libssh2 to crash, resulting in a denial of service.\n(CVE-2026-66033)\n\nIt was discovered that libssh2 incorrectly handled Encrypt-then-MAC cipher\nnegotiation. A remote attacker controlling an SSH server could use this\nissue to cause libssh2 to crash or possibly execute arbitrary code.\n(CVE-2026-66035)","modified":"2026-09-03T22:56:55.638746837Z","published":"2026-09-03T12:37:05Z","related":["UBUNTU-CVE-2026-66032","UBUNTU-CVE-2026-66033","UBUNTU-CVE-2026-66035"],"upstream":["CVE-2026-66032","CVE-2026-66033","CVE-2026-66035","UBUNTU-CVE-2026-66032","UBUNTU-CVE-2026-66033","UBUNTU-CVE-2026-66035"],"references":[{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-8722-1"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-66032"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-66033"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-66035"}],"affected":[{"package":{"name":"libssh2","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/libssh2?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.11.0-4.1ubuntu0.24.04.4"}]}],"versions":["1.11.0-2","1.11.0-3","1.11.0-4","1.11.0-4.1build1","1.11.0-4.1build2","1.11.0-4.1ubuntu0.24.04.1","1.11.0-4.1ubuntu0.24.04.2","1.11.0-4.1ubuntu0.24.04.3"],"ecosystem_specific":{"binaries":[{"binary_name":"libssh2-1t64","binary_version":"1.11.0-4.1ubuntu0.24.04.4"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8722-1.json","cves_map":{"cves":[{"id":"CVE-2026-66032","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"},{"score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","type":"CVSS_V4"},{"score":"medium","type":"Ubuntu"}]},{"id":"CVE-2026-66033","severity":[{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","type":"CVSS_V3"},{"score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","type":"CVSS_V4"},{"type":"Ubuntu","score":"medium"}]},{"id":"CVE-2026-66035","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H"},{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N"},{"type":"Ubuntu","score":"medium"}]}],"ecosystem":"Ubuntu:24.04:LTS"}}},{"package":{"name":"libssh2","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/libssh2?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.11.1-1ubuntu0.26.04.4"}]}],"versions":["1.11.1-1build1","1.11.1-1build2","1.11.1-1ubuntu0.26.04.1","1.11.1-1ubuntu0.26.04.2","1.11.1-1ubuntu0.26.04.3"],"ecosystem_specific":{"binaries":[{"binary_version":"1.11.1-1ubuntu0.26.04.4","binary_name":"libssh2-1t64"}],"availability":"No subscription required"},"database_specific":{"cves_map":{"cves":[{"id":"CVE-2026-66032","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":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N"},{"score":"medium","type":"Ubuntu"}]},{"severity":[{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","type":"CVSS_V3"},{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"},{"type":"Ubuntu","score":"medium"}],"id":"CVE-2026-66033"},{"id":"CVE-2026-66035","severity":[{"score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H","type":"CVSS_V3"},{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N"},{"type":"Ubuntu","score":"medium"}]}],"ecosystem":"Ubuntu:26.04:LTS"},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8722-1.json"}}],"schema_version":"1.9.0"}