CVE-2026-129120

Description

C-Kermit 11.0.506 before 11.1.515 contains a RECEIVE CONFIRM bypass vulnerability that allows malicious Kermit servers to write unrequested files without prompting by abusing recursive GET root computation in ckcfns.c. Attackers can send files such as .ssh/authorized_keys or shell startup files under the current directory, which rq_under_root() accepts silently, enabling persistent access or code execution.

References

• https://github.com/OpenKermit/ckermit/blob/v11.0.514/ckcfns.c#L3452
• https://github.com/OpenKermit/ckermit/commit/49e04a5ccfa08706b1d7e51dce4059f4adce50f3
• https://github.com/OpenKermit/ckermit/releases/tag/v11.1.515
• https://github.com/OpenKermit/ckermit/security/advisories/GHSA-vhrv-7jrq-95qj
• https://www.vulncheck.com/advisories/c-kermit-11.0.506-before-11.1.515-receive-confirm-bypass-via-recursive-get