{"id":"UBUNTU-CVE-2026-0968","details":"A flaw was found in libssh in which a malicious SFTP (SSH File Transfer Protocol) server can exploit this by sending a malformed 'longname' field within an `SSH_FXP_NAME` message during a file listing operation. This missing null check can lead to reading beyond allocated memory on the heap. This can cause unexpected behavior or lead to a denial of service (DoS) due to application crashes.","modified":"2026-04-14T10:13:48.832584Z","published":"2026-02-13T00:00:00Z","related":["USN-8051-1","USN-8051-2"],"upstream":["CVE-2026-0968"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-0968"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-0968"},{"type":"REPORT","url":"https://www.libssh.org/security/advisories/CVE-2026-0968.txt"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-8051-1"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-8051-2"}],"affected":[{"package":{"name":"libssh","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/libssh@0.6.3-4.3ubuntu0.6+esm4?arch=source&distro=esm-infra/xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.6.3-4.3ubuntu0.6+esm4"}]}],"versions":["0.6.3-3ubuntu3","0.6.3-4.1","0.6.3-4.2","0.6.3-4.2ubuntu1","0.6.3-4.3","0.6.3-4.3ubuntu0.1","0.6.3-4.3ubuntu0.2","0.6.3-4.3ubuntu0.5","0.6.3-4.3ubuntu0.6","0.6.3-4.3ubuntu0.6+esm1","0.6.3-4.3ubuntu0.6+esm2","0.6.3-4.3ubuntu0.6+esm3"],"ecosystem_specific":{"binaries":[{"binary_version":"0.6.3-4.3ubuntu0.6+esm4","binary_name":"libssh-4"},{"binary_version":"0.6.3-4.3ubuntu0.6+esm4","binary_name":"libssh-dev"},{"binary_version":"0.6.3-4.3ubuntu0.6+esm4","binary_name":"libssh-gcrypt-4"},{"binary_version":"0.6.3-4.3ubuntu0.6+esm4","binary_name":"libssh-gcrypt-dev"}],"availability":"Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-0968.json"}},{"package":{"name":"libssh","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/libssh@0.8.0~20170825.94fa1e38-1ubuntu0.7+esm6?arch=source&distro=esm-infra/bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.8.0~20170825.94fa1e38-1ubuntu0.7+esm6"}]}],"versions":["0.7.5-1","0.8.0~20170825.94fa1e38-1","0.8.0~20170825.94fa1e38-1build1","0.8.0~20170825.94fa1e38-1ubuntu0.1","0.8.0~20170825.94fa1e38-1ubuntu0.2","0.8.0~20170825.94fa1e38-1ubuntu0.5","0.8.0~20170825.94fa1e38-1ubuntu0.6","0.8.0~20170825.94fa1e38-1ubuntu0.7","0.8.0~20170825.94fa1e38-1ubuntu0.7+esm3","0.8.0~20170825.94fa1e38-1ubuntu0.7+esm4","0.8.0~20170825.94fa1e38-1ubuntu0.7+esm5"],"ecosystem_specific":{"binaries":[{"binary_version":"0.8.0~20170825.94fa1e38-1ubuntu0.7+esm6","binary_name":"libssh-4"},{"binary_version":"0.8.0~20170825.94fa1e38-1ubuntu0.7+esm6","binary_name":"libssh-dev"},{"binary_version":"0.8.0~20170825.94fa1e38-1ubuntu0.7+esm6","binary_name":"libssh-gcrypt-4"},{"binary_version":"0.8.0~20170825.94fa1e38-1ubuntu0.7+esm6","binary_name":"libssh-gcrypt-dev"}],"availability":"Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-0968.json"}},{"package":{"name":"libssh","ecosystem":"Ubuntu:Pro:20.04:LTS","purl":"pkg:deb/ubuntu/libssh@0.9.3-2ubuntu2.5+esm3?arch=source&distro=esm-infra/focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.9.3-2ubuntu2.5+esm3"}]}],"versions":["0.9.0-1ubuntu1","0.9.0-1ubuntu4","0.9.0-1ubuntu5","0.9.3-2ubuntu1","0.9.3-2ubuntu2","0.9.3-2ubuntu2.1","0.9.3-2ubuntu2.2","0.9.3-2ubuntu2.3","0.9.3-2ubuntu2.4","0.9.3-2ubuntu2.5","0.9.3-2ubuntu2.5+esm1","0.9.3-2ubuntu2.5+esm2"],"ecosystem_specific":{"binaries":[{"binary_version":"0.9.3-2ubuntu2.5+esm3","binary_name":"libssh-4"},{"binary_version":"0.9.3-2ubuntu2.5+esm3","binary_name":"libssh-dev"},{"binary_version":"0.9.3-2ubuntu2.5+esm3","binary_name":"libssh-gcrypt-4"},{"binary_version":"0.9.3-2ubuntu2.5+esm3","binary_name":"libssh-gcrypt-dev"}],"availability":"Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-0968.json"}},{"package":{"name":"libssh","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/libssh@0.9.6-2ubuntu0.22.04.6?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.9.6-2ubuntu0.22.04.6"}]}],"versions":["0.9.6-1","0.9.6-1build1","0.9.6-2","0.9.6-2build1","0.9.6-2ubuntu0.22.04.1","0.9.6-2ubuntu0.22.04.2","0.9.6-2ubuntu0.22.04.3","0.9.6-2ubuntu0.22.04.4","0.9.6-2ubuntu0.22.04.5"],"ecosystem_specific":{"binaries":[{"binary_version":"0.9.6-2ubuntu0.22.04.6","binary_name":"libssh-4"},{"binary_version":"0.9.6-2ubuntu0.22.04.6","binary_name":"libssh-dev"},{"binary_version":"0.9.6-2ubuntu0.22.04.6","binary_name":"libssh-gcrypt-4"},{"binary_version":"0.9.6-2ubuntu0.22.04.6","binary_name":"libssh-gcrypt-dev"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-0968.json"}},{"package":{"name":"libssh","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/libssh@0.10.6-2ubuntu0.3?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.10.6-2ubuntu0.3"}]}],"versions":["0.10.5-3ubuntu1","0.10.5-3ubuntu2","0.10.6-2","0.10.6-2build1","0.10.6-2build2","0.10.6-2ubuntu0.1","0.10.6-2ubuntu0.2"],"ecosystem_specific":{"binaries":[{"binary_version":"0.10.6-2ubuntu0.3","binary_name":"libssh-4"},{"binary_version":"0.10.6-2ubuntu0.3","binary_name":"libssh-dev"},{"binary_version":"0.10.6-2ubuntu0.3","binary_name":"libssh-gcrypt-4"},{"binary_version":"0.10.6-2ubuntu0.3","binary_name":"libssh-gcrypt-dev"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-0968.json"}},{"package":{"name":"libssh","ecosystem":"Ubuntu:25.10","purl":"pkg:deb/ubuntu/libssh@0.11.2-1ubuntu0.2?arch=source&distro=questing"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.11.2-1ubuntu0.2"}]}],"versions":["0.11.1-1","0.11.1-2","0.11.2-1","0.11.2-1build1","0.11.2-1ubuntu0.1"],"ecosystem_specific":{"binaries":[{"binary_version":"0.11.2-1ubuntu0.2","binary_name":"libssh-4"},{"binary_version":"0.11.2-1ubuntu0.2","binary_name":"libssh-dev"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-0968.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/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:H/I:H/A:H"},{"type":"CVSS_V3","score":"CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:L"},{"type":"Ubuntu","score":"medium"}]}