Vulnerability · Published Oct 29, 2026 · Assigned by Checkmk
CVE-2026-117611Trust of compromised eMudhra root CA in bundled CA stores
High 7.1
In plain English
A high-severity improper certificate validation in Checkmk from Checkmk GmbH. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 15% of all known vulnerabilities).
Severity (CVSS 4.0)7.1High
Exploit odds (30 days)0.2%top 85.1% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
Improper certificate validation in Checkmk <2.5.0p18, <2.4.0p39, <2.3.0p52 and 2.2.0 (EOL): the Certificate Authority stores bundled with "certifi" and "webpki-roots" include a root CA that trusts eMudhra (emSign) intermediate certificates whose private keys are public.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Checkmk GmbH | Checkmk | 2.5.0 – before 2.5.0p182.4.0 – before 2.4.0p392.3.0 – before 2.3.0p522.2.0 |
Weakness: CWE-295, CWE-1395 · Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:H/SI:H/SA:H
References
- https://checkmk.com/werk/22623 vendor-advisory
- https://checkmk.com/werk/22169 vendor-advisory
- https://github.com/advisories/GHSA-6q48-6c7w-9gw2 third-party-advisory