{"id":"CVE-2026-129126","summary":"C-Kermit before 11.1.515 Heap Buffer Overflow via putsrv() Packet Decoding","details":"C-Kermit before 11.1.515 contains a heap buffer overflow vulnerability in putsrv() in ckcfns.c that allows malicious peers to write past the srvcmd buffer by sending crafted packets. Attackers can use Kermit repeat-count compression in server command, GET, or file-header packets to write attacker-chosen bytes beyond the heap buffer on servers or receiving instances.","aliases":["CVE-2026-129122","CVE-2026-129123","CVE-2026-129124","CVE-2026-129125","GHSA-c5px-7h4c-gj8p"],"modified":"2026-11-14T02:56:11.103243781Z","published":"2026-11-13T16:23:41.944Z","database_specific":{"unresolved_ranges":[{"extracted_events":[{"range":[{"fixed":"11.1.515"}],"source":"AFFECTED_FIELD","strategy":"StandardRange"}]},{"extracted_events":[{"range":[{"fixed":"11.1.515"}],"source":"DESCRIPTION"}]}],"cna_assigner":"VulnCheck","cwe_ids":["CWE-122"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/129xxx/CVE-2026-129126.json"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/129xxx/CVE-2026-129126.json"},{"type":"ARTICLE","url":"https://github.com/OpenKermit/ckermit/blob/v11.0.514/ckcfns.c#L461"},{"type":"FIX","url":"https://github.com/OpenKermit/ckermit/commit/37e54720779237897bc6887efac42fe138817897"},{"type":"ADVISORY","url":"https://github.com/OpenKermit/ckermit/releases/tag/v11.1.515"},{"type":"ADVISORY","url":"https://github.com/OpenKermit/ckermit/security/advisories/GHSA-c5px-7h4c-gj8p"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-129126"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/c-kermit-before-11.1.515-heap-buffer-overflow-via-putsrv-packet-decoding"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/openkermit/ckermit","events":[{"introduced":"0"},{"fixed":"37e54720779237897bc6887efac42fe138817897"}],"database_specific":{"extracted_events":[{"source":"REFERENCES_COMMIT","range":[{"fixed":"37e54720779237897bc6887efac42fe138817897"}]}]}}],"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-2026-129126.json"}}],"schema_version":"1.9.2","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N"}]}