CVE-2026-129116 json
C-Kermit 7.0.197 before 11.1.515 IKSD Authentication Bypass via Refused Certificate Login
published 15d ago modified yesterday also EUVD-2026-125519 , GHSA-5pc4-gh6q-5h4w
Unreviewed: the maintainers' own advisory
Published by the maintainers on their GitHub repository OpenKermit/ckermit. GitHub has not reviewed it into the GitHub Advisory Database, so the affected packages and versions are the maintainers' word. Read the full advisory on GitHub.
- cvss
- 7.5
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.3%
- EPSS 0.3% chance of exploitation in 30 days, percentile 22%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- OpenKermit C-Kermit 11.1.515
- ckermit Debian 14 1:11.1.515-1
debian advisories DEBIAN-CVE-2026-129116
Is CVE-2026-129116 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.
Check with FencerExploit prediction
0.29% chance of exploitation in the next 30 days, higher than 22% of all scored CVEs (FIRST EPSS, 2026-11-14).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 7.7 | CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N |
| CNA | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H |
| CNA | 4.0 | 7.7 | CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |
| NVD | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H |
Affected products
- OpenKermit C-Kermit
Classification
- Weakness
-
- CWE-287 Improper Authentication
References
-
github.com
/OpenKermit/ckermit/commit/fdfe8f13159f9276d87e02bedba15946b0edda97
patch
-
github.com
/OpenKermit/ckermit/security/advisories/GHSA-5pc4-gh6q-5h4w
vendor-advisory, advisory
-
github.com
/OpenKermit/ckermit/releases/tag/v11.1.515
release-notes
-
github.com
/OpenKermit/ckermit/blob/v11.0.514/ckufio.c#L8249
technical-description
-
vulncheck.com
/advisories/c-kermit-7.0.197-before-11.1.515-iksd-authentication-bypass-via-refused-certificate-login
third-party-advisory
Sources
- CVE List CVE-2026-129116
- NVD CVE-2026-129116
- Maintainer advisory GHSA-5pc4-gh6q-5h4w
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
The maintainers of OpenKermit/ckermit published their own advisory on GitHub. Reviewed sources take precedence over it.