{"id":"UBUNTU-CVE-2025-4877","details":"There's a vulnerability in the libssh package where when a libssh consumer passes in an unexpectedly large input buffer to ssh_get_fingerprint_hash() function. In such cases the bin_to_base64() function can experience an integer overflow leading to a memory under allocation, when that happens it's possible that the program perform out of bounds write leading to a heap corruption. This issue affects only 32-bits builds of libssh.","modified":"2026-04-22T16:03:13.716285Z","published":"2025-06-25T00:00:00Z","related":["USN-7619-1","USN-7696-1"],"upstream":["CVE-2025-4877"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2025-4877"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2025-4877"},{"type":"REPORT","url":"https://www.libssh.org/security/advisories/CVE-2025-4877.txt"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-7619-1"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-7696-1"}],"affected":[{"package":{"name":"libssh","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/libssh@0.6.3-4.3ubuntu0.6+esm2?arch=source&distro=esm-infra/xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.6.3-4.3ubuntu0.6+esm2"}]}],"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"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro","binaries":[{"binary_version":"0.6.3-4.3ubuntu0.6+esm2","binary_name":"libssh-4"},{"binary_version":"0.6.3-4.3ubuntu0.6+esm2","binary_name":"libssh-gcrypt-4"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-4877.json"}},{"package":{"name":"libssh","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/libssh@0.8.0~20170825.94fa1e38-1ubuntu0.7+esm4?arch=source&distro=esm-infra/bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.8.0~20170825.94fa1e38-1ubuntu0.7+esm4"}]}],"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"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro","binaries":[{"binary_version":"0.8.0~20170825.94fa1e38-1ubuntu0.7+esm4","binary_name":"libssh-4"},{"binary_version":"0.8.0~20170825.94fa1e38-1ubuntu0.7+esm4","binary_name":"libssh-gcrypt-4"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-4877.json"}},{"package":{"name":"libssh","ecosystem":"Ubuntu:Pro:20.04:LTS","purl":"pkg:deb/ubuntu/libssh@0.9.3-2ubuntu2.5+esm1?arch=source&distro=esm-infra/focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.9.3-2ubuntu2.5+esm1"}]}],"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"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro","binaries":[{"binary_version":"0.9.3-2ubuntu2.5+esm1","binary_name":"libssh-4"},{"binary_version":"0.9.3-2ubuntu2.5+esm1","binary_name":"libssh-gcrypt-4"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-4877.json"}},{"package":{"name":"libssh","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/libssh@0.9.6-2ubuntu0.22.04.4?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.9.6-2ubuntu0.22.04.4"}]}],"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"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_version":"0.9.6-2ubuntu0.22.04.4","binary_name":"libssh-4"},{"binary_version":"0.9.6-2ubuntu0.22.04.4","binary_name":"libssh-gcrypt-4"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-4877.json"}},{"package":{"name":"libssh","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/libssh@0.10.6-2ubuntu0.1?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.10.6-2ubuntu0.1"}]}],"versions":["0.10.5-3ubuntu1","0.10.5-3ubuntu2","0.10.6-2","0.10.6-2build1","0.10.6-2build2"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_version":"0.10.6-2ubuntu0.1","binary_name":"libssh-4"},{"binary_version":"0.10.6-2ubuntu0.1","binary_name":"libssh-gcrypt-4"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-4877.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L"},{"type":"Ubuntu","score":"medium"}]}