{"id":"USN-8937-1","summary":"openssh, openssh-gssapi vulnerabilities","details":"It was discovered that OpenSSH's sftp client incorrectly handled paths\nreturned by the server during a recursive copy operation. A remote attacker\ncontrolling the server could possibly use this issue to write files to\nunintended locations. (CVE-2026-106552)\n\nIt was discovered that OpenSSH's sshd server incorrectly handled\nGSSAPIAuthentication state across authentication attempts. An attacker\ncould possibly use this issue to obtain credentials from a previous failed\nauthentication attempt. (CVE-2026-106553, CVE-2026-106555)\n\nIt was discovered that OpenSSH incorrectly used an LZ77 dictionary coder\nduring compression. An attacker could possibly use this issue to obtain\nsensitive information. (CVE-2026-106582)\n\nIt was discovered that OpenSSH's ssh client incorrectly allowed special\ncharacters in command-line usernames. An attacker could possibly use this\nissue to inject arbitrary commands via specially crafted usernames.\n(CVE-2026-106583)\n\nIt was discovered that OpenSSH's ssh-keygen incorrectly handled Daylight\nSaving Time when converting dates. An attacker could possibly use this\nissue to cause certificates to have incorrect expiration times.\n(CVE-2026-106584)\n\nIt was discovered that OpenSSH did not check whether the maximum packet\nlength was exceeded during decompression. A remote attacker could possibly\nuse this issue to cause a denial of service. (CVE-2026-106585)\n\nIt was discovered that OpenSSH's sshd server incorrectly applied the\nrestrict keyword from authorized_keys to tunnel forwarding requests. A\nlocal attacker with an authorized key could possibly use this issue to\nbypass intended tunnel forwarding restrictions. (CVE-2026-106586)\n\nIt was discovered that OpenSSH's sshd server incorrectly handled certain\nconfiguration options that accept a \"none\" value. An attacker could\npossibly use this issue to cause OpenSSH to behave unexpectedly.\n(CVE-2026-106587)","modified":"2026-10-19T23:43:21.200850366Z","published":"2026-10-19T13:34:39Z","related":["UBUNTU-CVE-2026-106552","UBUNTU-CVE-2026-106553","UBUNTU-CVE-2026-106555","UBUNTU-CVE-2026-106582","UBUNTU-CVE-2026-106583","UBUNTU-CVE-2026-106584","UBUNTU-CVE-2026-106585","UBUNTU-CVE-2026-106586","UBUNTU-CVE-2026-106587"],"upstream":["CVE-2026-106552","CVE-2026-106553","CVE-2026-106555","CVE-2026-106582","CVE-2026-106583","CVE-2026-106584","CVE-2026-106585","CVE-2026-106586","CVE-2026-106587","UBUNTU-CVE-2026-106552","UBUNTU-CVE-2026-106553","UBUNTU-CVE-2026-106555","UBUNTU-CVE-2026-106582","UBUNTU-CVE-2026-106583","UBUNTU-CVE-2026-106584","UBUNTU-CVE-2026-106585","UBUNTU-CVE-2026-106586","UBUNTU-CVE-2026-106587"],"references":[{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-8937-1"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-106552"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-106553"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-106555"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-106582"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-106583"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-106584"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-106585"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-106586"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-106587"}],"affected":[{"package":{"name":"openssh","ecosystem":"Ubuntu:26.10","purl":"pkg:deb/ubuntu/openssh?arch=source&distro=stonking"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:10.5p1-1ubuntu3.1"}]}],"versions":["1:10.2p1-2ubuntu3","1:10.3p1-4ubuntu1","1:10.3p1-4ubuntu2","1:10.5p1-1ubuntu2"],"ecosystem_specific":{"binaries":[{"binary_name":"openssh-client","binary_version":"1:10.5p1-1ubuntu3.1"},{"binary_version":"1:10.5p1-1ubuntu3.1","binary_name":"openssh-common"},{"binary_version":"1:10.5p1-1ubuntu3.1","binary_name":"openssh-server"},{"binary_name":"openssh-sftp-server","binary_version":"1:10.5p1-1ubuntu3.1"},{"binary_version":"1:10.5p1-1ubuntu3.1","binary_name":"openssh-tests"},{"binary_name":"ssh","binary_version":"1:10.5p1-1ubuntu3.1"},{"binary_name":"ssh-askpass-gnome","binary_version":"1:10.5p1-1ubuntu3.1"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8937-1.json","cves_map":{"ecosystem":"Ubuntu:26.10","cves":[{"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:L"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N"},{"type":"Ubuntu","score":"medium"}],"id":"CVE-2026-106552"},{"id":"CVE-2026-106553","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:L/I:N/A:N"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N"},{"score":"medium","type":"Ubuntu"}]},{"severity":[{"score":"CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:L/I:N/A:N","type":"CVSS_V3"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N"},{"type":"Ubuntu","score":"medium"}],"id":"CVE-2026-106555"},{"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N"},{"type":"Ubuntu","score":"medium"}],"id":"CVE-2026-106582"},{"id":"CVE-2026-106583","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N"},{"score":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","type":"CVSS_V3"},{"type":"Ubuntu","score":"medium"}]},{"id":"CVE-2026-106584","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N"},{"score":"medium","type":"Ubuntu"}]},{"severity":[{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}],"id":"CVE-2026-106585"},{"id":"CVE-2026-106586","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N"},{"score":"medium","type":"Ubuntu"}]},{"id":"CVE-2026-106587","severity":[{"score":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:L","type":"CVSS_V3"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N"},{"type":"Ubuntu","score":"medium"}]}]}}},{"package":{"name":"openssh-gssapi","ecosystem":"Ubuntu:26.10","purl":"pkg:deb/ubuntu/openssh-gssapi?arch=source&distro=stonking"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:10.5p1-1ubuntu3.1"}]}],"versions":["1:10.5p1-1ubuntu1","1:10.5p1-1ubuntu2","1:10.5p1-1ubuntu3"],"ecosystem_specific":{"binaries":[{"binary_name":"openssh-client-gssapi","binary_version":"1:10.5p1-1ubuntu3.1"},{"binary_name":"openssh-server-gssapi","binary_version":"1:10.5p1-1ubuntu3.1"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8937-1.json","cves_map":{"cves":[{"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:L"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N"},{"score":"medium","type":"Ubuntu"}],"id":"CVE-2026-106552"},{"id":"CVE-2026-106553","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:L/I:N/A:N"},{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}]},{"id":"CVE-2026-106555","severity":[{"score":"CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:L/I:N/A:N","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":"medium","type":"Ubuntu"}]},{"id":"CVE-2026-106582","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N"},{"score":"medium","type":"Ubuntu"}]},{"id":"CVE-2026-106583","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N"},{"score":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}]},{"id":"CVE-2026-106584","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N"},{"score":"medium","type":"Ubuntu"}]},{"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L"},{"score":"medium","type":"Ubuntu"}],"id":"CVE-2026-106585"},{"id":"CVE-2026-106586","severity":[{"score":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N","type":"CVSS_V3"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N"},{"score":"medium","type":"Ubuntu"}]},{"severity":[{"score":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:L","type":"CVSS_V3"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N"},{"type":"Ubuntu","score":"medium"}],"id":"CVE-2026-106587"}],"ecosystem":"Ubuntu:26.10"}}}],"schema_version":"1.9.0"}