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CVE-2026-129126

C-Kermit before 11.1.515 Heap Buffer Overflow via putsrv() Packet Decoding

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.

CVSS 4.0 · 9.2 Critical EPSS < 1% KEV · Not listed
Vendors
Openkermit
Products
C-kermit
CVE-2026-129125

C-Kermit 6.0.192 before 11.1.515 Command Execution via REMOTE QUERY

C-Kermit 6.0.192 before 11.1.515 contains a remote code execution vulnerability that allows Kermit clients to run shell commands on servers with host commands disabled by abusing REMOTE QUERY evaluation. Attackers can send a REMOTE QUERY invoking the command function, or define a macro via REMOTE ASSIGN and call execute to reach RUN, bypassing the nopush restriction and DISABLE HOST.

CVSS 4.0 · 9.2 Critical EPSS < 1% KEV · Not listed
Vendors
Openkermit
Products
C-kermit
CVE-2026-129124

C-Kermit before 11.1.515 OS Command Injection via REMOTE WHO and REMOTE SPACE

C-Kermit before 11.1.515 contains an OS command injection vulnerability that allows remote clients to execute shell commands by supplying unquoted arguments to REMOTE WHO or REMOTE SPACE. Attackers can append shell metacharacters to arguments passed through WHOCMD or SPACM2 to syscmd(), executing commands on the server host even when DISABLE HOST is set.

CVSS 4.0 · 9.2 Critical EPSS 1.3% KEV · Not listed
Vendors
Openkermit
Products
C-kermit
CVE-2026-129123

C-Kermit 8.0.200 before 11.1.515 FTP Client Buffer Overflow via PBSZ and ADAT Replies

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.

CVSS 4.0 · 8.7 High EPSS < 1% KEV · Not listed
Vendors
Openkermit
Products
C-kermit
CVE-2026-129122

C-Kermit 6.0.192 before 11.1.515 Buffer Overflow via Telnet NEW-ENVIRON Negotiation

C-Kermit 6.0.192 before 11.1.515 contains a buffer overflow vulnerability in tn_snenv() in ckctel.c that allows malicious Telnet servers to corrupt client memory via crafted NEW-ENVIRON SEND subnegotiation. Malicious or machine-in-the-middle servers can send oversized variable names before authentication, overflowing a 16-byte stack buffer and a miscomputed heap buffer to corrupt stack and heap memory.

CVSS 4.0 · 7.7 High EPSS < 1% KEV · Not listed
Vendors
Openkermit
Products
C-kermit
CVE-2026-129121

C-Kermit 8.0.200 before 11.1.515 Path Traversal via FTP MGET /RECURSIVE

C-Kermit 8.0.200 before 11.1.515 contains a path traversal vulnerability in doftpget() in ckcftp.c that allows malicious FTP servers to write files outside the intended directory. Attackers can return absolute paths, tilde names, or dot-dot components in NLST or MLSD listings during MGET /RECURSIVE to overwrite files like .bashrc, leading to code execution.

CVSS 4.0 · 6.9 Medium EPSS < 1% KEV · Not listed
Vendors
Openkermit
Products
C-kermit
CVE-2026-129120

C-Kermit 11.0.506 before 11.1.515 RECEIVE CONFIRM Bypass via Recursive GET

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.

CVSS 4.0 · 5.9 Medium EPSS < 1% KEV · Not listed
Vendors
Openkermit
Products
C-kermit
CVE-2026-129119

C-Kermit 6.0.192 before 11.1.515 File Collision Protection Bypass via RESEND

C-Kermit from 6.0.192 before 11.1.515 contains a file collision protection bypass that allows malicious senders to append data to existing files by marking transfers as RESEND. The gattr() function in ckcfn3.c clears the REJECT discard flag and switches to APPEND without a RECEIVE CONFIRM prompt, letting attackers modify files such as shell startup files.

CVSS 4.0 · 7.1 High EPSS < 1% KEV · Not listed
Vendors
Openkermit
Products
C-kermit
CVE-2026-129118

C-Kermit 8.0.200 before 11.1.515 Improper Certificate Hostname Matching via dNSName_cmp

C-Kermit 8.0.200 before 11.1.515 contains an improper certificate hostname validation vulnerability that allows attackers to impersonate hosts by abusing wildcard matching in dNSName_cmp() in ck_ssl.c. Attackers holding a trusted certificate with over-matching names containing asterisks, question marks, brackets, or empty labels can intercept credentials and data over Telnet, FTP, and HTTP TLS connections.

CVSS 4.0 · 7.6 High EPSS < 1% KEV · Not listed
Vendors
Openkermit
Products
C-kermit
CVE-2026-129117

C-Kermit 8.0.200 before 11.1.515 Missing Hostname Verification in AUTHENTICATION SSL

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.

CVSS 4.0 · 7.6 High EPSS < 1% KEV · Not listed
Vendors
Openkermit
Products
C-kermit
CVE-2026-129116

C-Kermit 7.0.197 before 11.1.515 IKSD Authentication Bypass via Refused Certificate Login

C-Kermit from 7.0.197 before 11.1.515 contains an authentication bypass vulnerability in the IKSD SSL build that leaves Telnet authentication state at AUTH_VALID after a refused certificate login. Attackers holding a trusted certificate mapped to a refused account can log in as any other account with any password, gaining that account's shell access.

CVSS 4.0 · 7.7 High EPSS < 1% KEV · Not listed
Vendors
Openkermit
Products
C-kermit