Bug 2573246 (CVE-2026-129123)

Summary: CVE-2026-129123 ckermit: ckermit: Arbitrary code execution via overly long FTP server replies
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: high    
Version: unspecifiedKeywords: Security
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OS: Linux   
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A flaw was found in ckermit. When connecting to a malicious or compromised File Transfer Protocol (FTP) server, an attacker can send excessively long security handshake responses to trigger a buffer overflow. This vulnerability allows the remote server to overwrite client memory, potentially leading to arbitrary code execution or a denial of service (DoS) on the client system.
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Description OSIDB Bzimport 2026-11-13 16:32:17 UTC 
C-Kermit 8.0.200 before 11.1.515 contains a buffer overflow vulnerability in getreply() in ckcftp.c that allows malicious FTP servers to overwrite client memory by sending overlong security replies. Attackers controlling or intercepting an FTP server can send long PBSZ replies after AUTH TLS, or long ADAT replies in GSSAPI, Kerberos 4, and SRP builds, overflowing the static reply_buf with attacker-controlled bytes.