{"id":"CVE-2026-129117","summary":"C-Kermit 8.0.200 before 11.1.515 Missing Hostname Verification in AUTHENTICATION SSL","details":"C-Kermit 8.0.200 before 11.1.515 contains an improper certificate validation vulnerability that allows machine-in-the-middle attackers to impersonate Telnet servers because ssl_reply() never calls ssl_check_server_name(). Attackers can refuse START-TLS, offer Telnet AUTHENTICATION SSL, and present any trusted CA certificate to capture user credentials and session data.","aliases":["CVE-2026-129116","CVE-2026-129118","GHSA-5pc4-gh6q-5h4w"],"modified":"2026-11-14T02:56:11.265042836Z","published":"2026-11-13T16:23:48.065Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/129xxx/CVE-2026-129117.json","unresolved_ranges":[{"extracted_events":[{"strategy":"StandardRange","range":[{"introduced":"8.0.200"},{"fixed":"11.1.515"}],"source":"AFFECTED_FIELD"}]},{"extracted_events":[{"source":"DESCRIPTION","range":[{"introduced":"8.0.200"},{"fixed":"11.1.515"}]}]}],"cna_assigner":"VulnCheck","cwe_ids":["CWE-297"]},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/129xxx/CVE-2026-129117.json"},{"type":"ARTICLE","url":"https://github.com/OpenKermit/ckermit/blob/v11.0.514/ck_ssl.c#L3916"},{"type":"FIX","url":"https://github.com/OpenKermit/ckermit/commit/0008b429e4fadc8ecfd3d7d661fd55d72e26d527"},{"type":"ADVISORY","url":"https://github.com/OpenKermit/ckermit/releases/tag/v11.1.515"},{"type":"ADVISORY","url":"https://github.com/OpenKermit/ckermit/security/advisories/GHSA-5pc4-gh6q-5h4w"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-129117"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/c-kermit-8.0.200-before-11.1.515-missing-hostname-verification-in-authentication-ssl"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/openkermit/ckermit","events":[{"introduced":"0"},{"fixed":"0008b429e4fadc8ecfd3d7d661fd55d72e26d527"}],"database_specific":{"extracted_events":[{"range":[{"fixed":"0008b429e4fadc8ecfd3d7d661fd55d72e26d527"}],"source":"REFERENCES_COMMIT"}]}}],"versions":["v11.0.514","v11.0.513","v11.0.512","v11.0.511","v11.0.510","v11.0.509","v11.0.508","v11.0.507","v11.0.506","v11.0.505","v11.0.504","v11.0.503","v11.0.502","v11.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-129117.json"}}],"schema_version":"1.9.2","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N"}]}