Is there a public exploit for CVE-2026-129122?

No public exploit for CVE-2026-129122 was found in Exploit-DB, Metasploit, Nuclei templates or public proof-of-concept repositories. That is an absence of evidence rather than proof that none exists.

How severe is CVE-2026-129122?

CVE-2026-129122 scores CVSS 7.7 (v4.0), rated high.

What does CVE-2026-129122 affect?

CVE-2026-129122 affects OpenKermit C-Kermit.

7.7 High

C-Kermit 6.0.192 before 11.1.515 contains a buffer overflow vulnerability in tnsnenv() in ckctel.c that allows malicious Telnet servers to…

CVE-2026-129122

C-Kermit 6.0.192 before 11.1.515 contains a buffer overflow vulnerability in tnsnenv() 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.

Assessment

CVSS: 7.7 (v4.0)
Severity: High
Known exploited: Not listed in CISA KEV
Exploit availability: Nothing found in Exploit-DB, Metasploit, Nuclei or public PoC repositories
Published: 13 November 2026
Last updated: 13 November 2026
Affected: OpenKermit · C-Kermit
Assigner: VulnCheck

CVSS vectorCVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

At the source

EUVD (ENISA)

References

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