{"id":"USN-8090-1","summary":"openssh vulnerabilities","details":"Jeremy Brown discovered that the OpenSSH GSSAPI Key Exchange incorrectly\nhandled disconnecting clients. In non-default configurations where the\nGSSAPIKeyExchange setting is enabled, a remote attacker could use this\nissue to cause OpenSSH to crash, resulting in a denial of service, or\npossibly execute arbitrary code. (CVE-2026-3497)\n\nDavid Leadbeater discovered that OpenSSH incorrectly handled certain\ncontrol characters in usernames. When untrusted usernames and the\nProxyCommand are being used, an attacker could possibly use this issue to\nexecute arbitrary code. (CVE-2025-61984)\n\nDavid Leadbeater discovered that OpenSSH incorrectly handled NULL\ncharacters in ssh:// URIs. When the ProxyCommand is being used, an attacker\ncould possibly use this issue to execute arbitrary code. (CVE-2025-61985)","modified":"2026-03-17T06:42:31.892424Z","published":"2026-03-12T18:16:18Z","related":["UBUNTU-CVE-2025-61984","UBUNTU-CVE-2025-61985","UBUNTU-CVE-2026-3497"],"upstream":["CVE-2025-61984","CVE-2025-61985","CVE-2026-3497","UBUNTU-CVE-2025-61984","UBUNTU-CVE-2025-61985","UBUNTU-CVE-2026-3497"],"references":[{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-8090-1"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2025-61984"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2025-61985"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-3497"}],"affected":[{"package":{"name":"openssh","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/openssh@1:8.9p1-3ubuntu0.14?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:8.9p1-3ubuntu0.14"}]}],"versions":["1:8.4p1-6ubuntu2","1:8.7p1-2","1:8.7p1-2build1","1:8.7p1-4","1:8.8p1-1","1:8.9p1-3","1:8.9p1-3ubuntu0.1","1:8.9p1-3ubuntu0.3","1:8.9p1-3ubuntu0.4","1:8.9p1-3ubuntu0.5","1:8.9p1-3ubuntu0.6","1:8.9p1-3ubuntu0.7","1:8.9p1-3ubuntu0.10","1:8.9p1-3ubuntu0.11","1:8.9p1-3ubuntu0.13"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_name":"openssh-client","binary_version":"1:8.9p1-3ubuntu0.14"},{"binary_name":"openssh-server","binary_version":"1:8.9p1-3ubuntu0.14"},{"binary_name":"openssh-sftp-server","binary_version":"1:8.9p1-3ubuntu0.14"},{"binary_name":"openssh-tests","binary_version":"1:8.9p1-3ubuntu0.14"},{"binary_name":"ssh","binary_version":"1:8.9p1-3ubuntu0.14"},{"binary_name":"ssh-askpass-gnome","binary_version":"1:8.9p1-3ubuntu0.14"}]},"database_specific":{"cves_map":{"cves":[{"id":"CVE-2025-61984","severity":[{"score":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N","type":"CVSS_V3"},{"score":"low","type":"Ubuntu"}]},{"id":"CVE-2025-61985","severity":[{"score":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N","type":"CVSS_V3"},{"score":"low","type":"Ubuntu"}]},{"id":"CVE-2026-3497","severity":[{"score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N","type":"CVSS_V4"},{"score":"medium","type":"Ubuntu"}]}],"ecosystem":"Ubuntu:22.04:LTS"},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8090-1.json"}},{"package":{"name":"openssh","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/openssh@1:9.6p1-3ubuntu13.15?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:9.6p1-3ubuntu13.15"}]}],"versions":["1:9.3p1-1ubuntu3","1:9.4p1-1ubuntu1","1:9.6p1-3ubuntu1","1:9.6p1-3ubuntu2","1:9.6p1-3ubuntu11","1:9.6p1-3ubuntu12","1:9.6p1-3ubuntu13","1:9.6p1-3ubuntu13.3","1:9.6p1-3ubuntu13.4","1:9.6p1-3ubuntu13.5","1:9.6p1-3ubuntu13.7","1:9.6p1-3ubuntu13.8","1:9.6p1-3ubuntu13.9","1:9.6p1-3ubuntu13.11","1:9.6p1-3ubuntu13.12","1:9.6p1-3ubuntu13.13","1:9.6p1-3ubuntu13.14"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_name":"openssh-client","binary_version":"1:9.6p1-3ubuntu13.15"},{"binary_name":"openssh-server","binary_version":"1:9.6p1-3ubuntu13.15"},{"binary_name":"openssh-sftp-server","binary_version":"1:9.6p1-3ubuntu13.15"},{"binary_name":"openssh-tests","binary_version":"1:9.6p1-3ubuntu13.15"},{"binary_name":"ssh","binary_version":"1:9.6p1-3ubuntu13.15"},{"binary_name":"ssh-askpass-gnome","binary_version":"1:9.6p1-3ubuntu13.15"}]},"database_specific":{"cves_map":{"cves":[{"id":"CVE-2025-61984","severity":[{"score":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N","type":"CVSS_V3"},{"score":"low","type":"Ubuntu"}]},{"id":"CVE-2025-61985","severity":[{"score":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N","type":"CVSS_V3"},{"score":"low","type":"Ubuntu"}]},{"id":"CVE-2026-3497","severity":[{"score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N","type":"CVSS_V4"},{"score":"medium","type":"Ubuntu"}]}],"ecosystem":"Ubuntu:24.04:LTS"},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8090-1.json"}},{"package":{"name":"openssh","ecosystem":"Ubuntu:25.10","purl":"pkg:deb/ubuntu/openssh@1:10.0p1-5ubuntu5.1?arch=source&distro=questing"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:10.0p1-5ubuntu5.1"}]}],"versions":["1:9.9p1-3ubuntu3","1:9.9p1-3ubuntu3.1","1:10.0p1-5ubuntu2","1:10.0p1-5ubuntu3","1:10.0p1-5ubuntu4","1:10.0p1-5ubuntu5"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_name":"openssh-client","binary_version":"1:10.0p1-5ubuntu5.1"},{"binary_name":"openssh-client-gssapi","binary_version":"1:10.0p1-5ubuntu5.1"},{"binary_name":"openssh-server","binary_version":"1:10.0p1-5ubuntu5.1"},{"binary_name":"openssh-server-gssapi","binary_version":"1:10.0p1-5ubuntu5.1"},{"binary_name":"openssh-sftp-server","binary_version":"1:10.0p1-5ubuntu5.1"},{"binary_name":"openssh-tests","binary_version":"1:10.0p1-5ubuntu5.1"},{"binary_name":"ssh","binary_version":"1:10.0p1-5ubuntu5.1"},{"binary_name":"ssh-askpass-gnome","binary_version":"1:10.0p1-5ubuntu5.1"}]},"database_specific":{"cves_map":{"cves":[{"id":"CVE-2025-61984","severity":[{"score":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N","type":"CVSS_V3"},{"score":"low","type":"Ubuntu"}]},{"id":"CVE-2025-61985","severity":[{"score":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N","type":"CVSS_V3"},{"score":"low","type":"Ubuntu"}]},{"id":"CVE-2026-3497","severity":[{"score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N","type":"CVSS_V4"},{"score":"medium","type":"Ubuntu"}]}],"ecosystem":"Ubuntu:25.10"},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8090-1.json"}}],"schema_version":"1.7.5"}