Bug 2573238 (CVE-2026-129120)

Summary: CVE-2026-129120 ckermit: ckermit: Arbitrary code execution via receive confirmation bypass
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
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Priority: medium    
Version: unspecifiedKeywords: Security
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OS: Linux   
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A flaw was found in C-Kermit. A malicious server can bypass file receive confirmation checks during recursive file retrieval operations. This flaw allows the server to write unrequested files directly into the client's working directory without prompting, which can lead to arbitrary code execution or persistent unauthorized access.
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Description OSIDB Bzimport 2026-11-13 16:31:44 UTC 
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.