{"id":"UBUNTU-CVE-2025-26466","details":"A flaw was found in the OpenSSH package. For each ping packet the SSH server receives, a pong packet is allocated in a memory buffer and stored in a queue of packages. It is only freed when the server/client key exchange has finished. A malicious client may keep sending such packages, leading to an uncontrolled increase in memory consumption on the server side. Consequently, the server may become unavailable, resulting in a denial of service attack.","modified":"2026-02-04T02:32:20.143845Z","published":"2025-02-18T00:00:00Z","related":["USN-7270-1"],"upstream":["CVE-2025-26466"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2025-26466"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2025-26466"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-7270-1"}],"affected":[{"package":{"name":"openssh","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/openssh@1:9.6p1-3ubuntu13.8?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:9.6p1-3ubuntu13.8"}]}],"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"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_name":"openssh-client","binary_version":"1:9.6p1-3ubuntu13.8"},{"binary_name":"openssh-server","binary_version":"1:9.6p1-3ubuntu13.8"},{"binary_version":"1:9.6p1-3ubuntu13.8","binary_name":"openssh-sftp-server"},{"binary_name":"openssh-tests","binary_version":"1:9.6p1-3ubuntu13.8"},{"binary_version":"1:9.6p1-3ubuntu13.8","binary_name":"ssh"},{"binary_version":"1:9.6p1-3ubuntu13.8","binary_name":"ssh-askpass-gnome"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-26466.json"}}],"schema_version":"1.7.3","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"Ubuntu","score":"medium"}]}