{"id":"CVE-2026-59849","title":"A flaw was found in libssh","summary":"A flaw was found in libssh. Logic errors in automatic certificate-based public key authentication can cause libssh clients to loop indefinitely when configured certificates are missing or repeatedly rejected by a server, leading to denia…","severity":"low","cvss":3.1,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L","cwe":["CWE-835"],"vendor":"libssh","product":"libssh","affected":["libssh >= 0.11.0, < 0.11.5","libssh = 0.12.0","hardened_images","enterprise_linux = 10.0","enterprise_linux = 10.2","enterprise_linux_for_els = 10.2","enterprise_linux_for_eus = 10.2","enterprise_linux_for_ibm_z_systems = 10.0","enterprise_linux_for_ibm_z_systems = 10.2","enterprise_linux_for_ibm_z_systems_els = 10.2","enterprise_linux_for_ibm_z_systems_eus = 10.2","enterprise_linux_for_power_little_endian = 10.0","enterprise_linux_for_power_little_endian = 10.2","enterprise_linux_for_power_little_endian_els = 10.2","enterprise_linux_for_power_little_endian_eus = 10.2"],"patched":["libssh 0.11.5"],"published":"2026-07-21","updated":"2026-09-22","sourceUpdated":"2026-09-22T19:48:05.513","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-59849","references":[{"url":"https://access.redhat.com/errata/RHSA-2026:42922","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:55855","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/security/cve/CVE-2026-59849","label":"secalert@redhat.com"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2498182","label":"secalert@redhat.com"}],"tags":["nvd"],"epss":0.00244,"epssPercentile":0.15897,"ingestedAt":"2026-09-22T20:10:15.030Z","slug":"CVE-2026-59849","body":"## Overview\n\nA flaw was found in libssh. Logic errors in automatic certificate-based public key authentication can cause libssh clients to loop indefinitely when configured certificates are missing or repeatedly rejected by a server, leading to denial of service.\n\n## Affected\n\n- `libssh >= 0.11.0, < 0.11.5`\n- `libssh = 0.12.0`\n- `hardened_images`\n- `enterprise_linux = 10.0`\n- `enterprise_linux = 10.2`\n- `enterprise_linux_for_els = 10.2`\n- `enterprise_linux_for_eus = 10.2`\n- `enterprise_linux_for_ibm_z_systems = 10.0`\n- `enterprise_linux_for_ibm_z_systems = 10.2`\n- `enterprise_linux_for_ibm_z_systems_els = 10.2`\n- `enterprise_linux_for_ibm_z_systems_eus = 10.2`\n- `enterprise_linux_for_power_little_endian = 10.0`\n- `enterprise_linux_for_power_little_endian = 10.2`\n- `enterprise_linux_for_power_little_endian_els = 10.2`\n- `enterprise_linux_for_power_little_endian_eus = 10.2`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `libssh 0.11.5`","depth":"sunlit","depthScore":17,"depthScoreParts":{"impact":17.1,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}