CVE-2026-129116

CVSS 7.7 (high) · published 2026-11-13

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.

Weakness: CWE-287

Source: NVD CVE-2026-129116

References

• https://github.com/OpenKermit/ckermit/blob/v11.0.514/ckufio.c#L8249
• https://github.com/OpenKermit/ckermit/commit/fdfe8f13159f9276d87e02bedba15946b0edda97
• https://github.com/OpenKermit/ckermit/releases/tag/v11.1.515
• https://github.com/OpenKermit/ckermit/security/advisories/GHSA-5pc4-gh6q-5h4w
• https://www.vulncheck.com/advisories/c-kermit-7.0.197-before-11.1.515-iksd-authentication-bypass-via-refused-certificate-login

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