Checkmk End of Life (EOL) Dates & Support Timeline
Complete end-of-life dates, support windows, and security status for all Checkmk versions. Data sourced from endoflife.date and official vendor documentation. Updated at every deploy.
⚡Checkmk 2.3 reaches end of life on October 29, 2026. Plan your migration now — 105 days remaining.
📅 Get reminded before Checkmk 2.3 reaches EOL on October 29, 2026 — alerts 90, 30 & 7 days out.
What does Checkmk end of life mean for your organization?
When a version of Checkmk reaches end of life, the maintainers stop issuing security patches. Vulnerabilities discovered after this date are publicly disclosed on the National Vulnerability Database, exploit code appears on GitHub, and your systems remain permanently exposed.
The CVE blind spot: Most vulnerability scanners check for known CVEs but do not flag the accumulation of unpatched vulnerabilities in EOL software. With a zero-day, nobody knows about the vulnerability. With EOL software, the vulnerability is public — listed, rated, and often weaponized — but no patch will ever exist. This is the most dangerous gap in enterprise security posture.
Organizations running EOL Checkmk should treat it as a vulnerability class in their risk register, apply compensating controls (network segmentation, enhanced monitoring, access restriction), and prioritize migration to a supported version.
Extended Support Options
If you cannot migrate immediately, extended support vendors provide continued security patches for EOL Checkmk versions. This is a bridge, not a permanent solution — plan your migration in parallel.
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Checkmk has 1 version past end of life — security patches have stopped, but CVE disclosures haven't. Tell us where to reach you and we'll match you with vetted extended-support providers for your stack. Free, no obligation.
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Frequently Asked Questions
What is the end-of-life date for Checkmk?
The next Checkmk version reaching EOL is 2.3 on October 29, 2026. See the full table above for all version EOL dates.
When is the Checkmk support end date?
The next Checkmk support end date is October 29, 2026, when version 2.3 reaches end of support. Each version has its own support end date — see the table above for every version's date.
What is the latest supported version of Checkmk?
The latest active version of Checkmk is 2.5. Always verify against the table above as support windows can change.
What happens when Checkmk reaches end of life?
When Checkmk reaches end of life, the vendor stops issuing security patches. Any CVEs disclosed after the EOL date accumulate indefinitely with no patch path — creating an ever-growing attack surface that most vulnerability scanners do not flag.
How do I check if I'm running an EOL version of Checkmk?
Check your current version against the table above. If your version's EOL date has passed, you are running unsupported software. You can also use the endoflife.ai Stack Scanner to check your entire dependency file at once.
Is there extended support available for EOL Checkmk versions?
Some vendors offer extended support for EOL software. Contact the original vendor or check with enterprise support providers for options.