{"schemaVersion":3,"id":"CVE-2025-4877","aliases":["UBUNTU-CVE-2025-4877","DEBIAN-CVE-2025-4877"],"status":"published","duplicateOf":null,"title":null,"description":"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.\nThis issue affects only 32-bits builds of libssh.","dates":{"published":"2025-08-20T12:19:18.520Z","modified":"2026-08-31T11:28:35.916Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":4.5,"severity":"medium","version":"3.1","versionLabel":"v3.1","source":"CVE.org","vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"CVE.org","score":4.5,"severity":"medium","vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"OSV · 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Write","description":"The product writes data past the end, or before the beginning, of the intended buffer.","type":"weakness","status":"Draft","abstraction":"Base","likelihoodOfExploit":"High","url":"https://cwe.mitre.org/data/definitions/787.html"}],"affected":[{"vendor":"debian","product":"libssh","name":"libssh","label":"libssh","ecosystem":"Debian","cpePart":null,"purl":"pkg:deb/debian/libssh","purlType":"deb","versions":[{"text":"< 0.10.6-0+deb12u2","noFixRecorded":false,"fixedIn":null},{"text":"< 0.11.2-1","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 0.10.6-0+deb12u2 | < 0.11.2-1","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"libssh","name":"libssh","label":"libssh","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/libssh","purlType":"deb","versions":[{"text":"< 0.6.3-4.3ubuntu0.6+esm2","noFixRecorded":false,"fixedIn":null},{"text":"< 0.8.0~20170825.94fa1e38-1ubuntu0.7+esm4","noFixRecorded":false,"fixedIn":null},{"text":"< 0.9.3-2ubuntu2.5+esm1","noFixRecorded":false,"fixedIn":null},{"text":"< 0.9.6-2ubuntu0.22.04.4","noFixRecorded":false,"fixedIn":null},{"text":"< 0.10.6-2ubuntu0.1","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 0.6.3-4.3ubuntu0.6+esm2 | < 0.8.0~20170825.94fa1e38-1ubuntu0.7+esm4 | < 0.9.3-2ubuntu2.5+esm1 | < 0.9.6-2ubuntu0.22.04.4 | < 0.10.6-2ubuntu0.1","eol":null,"hubHref":null}],"affectedCount":2,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://access.redhat.com/errata/RHSA-2026:18683","label":"access.redhat.com/errata/RHSA-2026:18683","hostname":"access.redhat.com","tags":["Vendor Advisory","X Refsource REDHAT"]},{"url":"https://access.redhat.com/security/cve/CVE-2025-4877","label":"access.redhat.com/security/cve/CVE-2025-4877","hostname":"access.redhat.com","tags":["VDB Entry","X Refsource REDHAT"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2376193","label":"bugzilla.redhat.com/show_bug.cgi?id=2376193","hostname":"bugzilla.redhat.com","tags":["Issue 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REDHAT"]},{"url":"https://git.libssh.org/projects/libssh.git/commit/?h=stable-0.11&id=6fd9cc8ce3958092a1aae11f1f2e911b2747732d","label":"git.libssh.org/projects/libssh.git/commit/?h=stable-0.11&id=6fd9cc8ce3958092a1aae11f1f2e911b2747732d","hostname":"git.libssh.org","tags":[]},{"url":"https://www.libssh.org/security/advisories/CVE-2025-4877.txt","label":"www.libssh.org/security/advisories/CVE-2025-4877.txt","hostname":"www.libssh.org","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2025-4877","label":"ubuntu.com/security/CVE-2025-4877","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2025-4877","label":"www.cve.org/CVERecord?id=CVE-2025-4877","hostname":"www.cve.org","tags":["REPORT"]},{"url":"https://ubuntu.com/security/notices/USN-7619-1","label":"ubuntu.com/security/notices/USN-7619-1","hostname":"ubuntu.com","tags":["Advisory"]},{"url":"https://ubuntu.com/security/notices/USN-7696-1","label":"ubuntu.com/security/notices/USN-7696-1","hostname":"ubuntu.com","tags":["Advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2025-4877","label":"security-tracker.debian.org/tracker/CVE-2025-4877","hostname":"security-tracker.debian.org","tags":["Advisory"]}],"lineage":{"upstream":[],"downstream":["DLA-4385-1","MGASA-2026-0189","OPENSUSE-SU-2025:15243-1","RHSA-2026:18683","SUSE-SU-2025:02229-1","SUSE-SU-2025:02278-1","SUSE-SU-2025:02279-1","SUSE-SU-2025:02281-1","SUSE-SU-2025:02755-1","SUSE-SU-2025:20557-1","SUSE-SU-2025:20596-1","USN-7619-1","USN-7696-1"],"duplicates":[],"related":["OPENSUSE-SU-2025:15243-1","SUSE-SU-2025:02229-1","SUSE-SU-2025:02278-1","SUSE-SU-2025:02279-1","SUSE-SU-2025:02281-1","SUSE-SU-2025:02755-1","SUSE-SU-2025:20557-1","SUSE-SU-2025:20596-1","USN-7619-1","USN-7696-1"]},"timeline":[{"kind":"published","date":"2025-08-20T12:19:18.520Z","label":"Published","detail":"Vulnerability 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