OpenBSD vulnerabilities: known CVEs & security history
OpenBSD · OS / Unix · 10 tracked CVEs · 0 actively exploited · updated September 2026 · what is a CVE? →
This is the full list of known vulnerabilities (CVEs) across all OpenBSD release lines — 10 in total. A CVE here doesn't mean your version is affected — check OpenBSD's current status and the safe version to run.
Known OpenBSD CVEs
Actively-exploited and most-severe first. Open any CVE for full details.
| CVE | Severity | CVSS | EPSS | Year |
|---|---|---|---|---|
| CVE-2022-27881 | high | 7.5 | 2% | 2022 |
| CVE-2026-57589 | high | 7.4 | 0% | 2026 |
| CVE-2000-0995 | high | 7.2 | 1% | 2000 |
| CVE-2000-0996 | high | 7.2 | 1% | 2000 |
| CVE-2000-0993 | high | 7.2 | 2% | 2000 |
| CVE-2000-0994 | high | 7.2 | 1% | 2000 |
| CVE-2000-0997 | high | 7.2 | 1% | 2000 |
| CVE-2026-55706 | medium | 5.8 | 0% | 2026 |
| CVE-2026-56099 | medium | 5.3 | 0% | 2026 |
| CVE-2000-0914 | medium | 5 | 3% | 2000 |
Is my OpenBSD version affected?
The list above spans every release. To know whether your version is affected — and the minimum safe version to upgrade to — check it directly.
Check your OpenBSD version → · Monitor OpenBSD for new CVEs →
OpenBSD vulnerabilities — frequently asked
How many known vulnerabilities does OpenBSD have?
IsItPatched tracks 10 CVEs for OpenBSD. 0 are critical-severity and 7 high-severity. These span every release line — what matters is whether the version you run is affected.
Does OpenBSD have any actively-exploited vulnerabilities?
None of OpenBSD's tracked CVEs are currently in CISA's KEV catalog — but new ones can be added at any time, so keep your version current.
What is the most severe OpenBSD vulnerability?
Among tracked issues, CVE-2022-27881 (HIGH, CVSS 7.5) ranks highest — a Buffer overflow weakness.
Is OpenBSD safe to use?
It depends on the version. The latest supported OpenBSD release clears the known issues; older versions may still be affected. Check the exact version you run for a verdict.
CVE data aggregated from NVD, CISA KEV and EPSS (FIRST.org). Related: OpenBSD security status · OpenBSD end-of-life · actively-exploited CVEs. Always verify against OpenBSD's advisories — see our disclaimer.