CVE-2026-129118

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

Published Nov 13, 2026 CVSS 4.0 · 7.6 High EPSS n/a KEV · Not listed

Description

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.

Affected Products

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

OpenKermit

C-Kermit

unaffected

Version	Status	Constraints
`8.0.200`	affected	< 11.1.515

No data.

No data available yet.

Remediation

No solution or workaround provided in the CVE record

Tracking

Advisories

No advisories available

Metrics

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements Present

User Interaction Passive

Vulnerable System Confidentiality Impact High

Vulnerable System Integrity Impact High

Vulnerable System Availability Impact None

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity High

Privileges Required None

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact None

User Interaction Required

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

References

Link	Providers
https://github.com/OpenKermit/ckermit/blob/v11.0.514/ck_ssl.c#L3485
https://github.com/OpenKermit/ckermit/commit/8c60a2bd70f5a78e77ce5d140a17e7a9cdcd5e60
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-8.0.200-before-11.1.515-improper-certificate-hostname-matching-via-dnsname-cmp

History

Nov 13, 2026 4:30 PM Description updated. Title updated. Weaknesses updated. Added references. Scoring metrics updated View changes

Type	Values Removed	Values Added
Description		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.
Title		C-Kermit 8.0.200 before 11.1.515 Improper Certificate Hostname Matching via dNSName_cmp
Weaknesses		CWE-297
References		https://github.com/OpenKermit/ckermit/blob/v11.0.514/ck_ssl.c#L3485 https://github.com/OpenKermit/ckermit/commit/8c60a2bd70f5a78e77ce5d140a17e7a9cdcd5e60 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-8.0.200-before-11.1.515-improper-certificate-hostname-matching-via-dnsname-cmp
Metrics		cvssV3_1 `{'score': 6.8, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N'}` cvssV4_0 `{'score': 7.6, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N'}`