What is CVE-2026-34387?

CVE-2026-34387 is a critical-severity vulnerability in Fleetdm Fleet, classified under OS Command Injection. CVSS score: 9.8/10. Published 2026-03-27.

How severe is CVE-2026-34387?

Critical severity. CVSS v3 base score is 9.8 out of 10.

RCE in Fleetdm Fleet

CVE-2026-34387

Fleet is open source device management software. Prior to 4.81.1, a command injection vulnerability in Fleet's software installer pipeline allows an attacker to achieve arbitrary code execution as root (macOS/Linux) or SYSTEM (Windows) on…

Vulnerability class: Command Injection (OS Command Injection)

EPSS: 0.013 (66.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Fleetdm Fleet — versions < 4.81.1

Weakness classification (CWE)

CWE-78 — OS Command Injection

References

security-advisories@github.com (x_refsource_CONFIRM, Vendor Advisory)

Frequently asked questions

What is CVE-2026-34387?: CVE-2026-34387 is a critical-severity vulnerability in Fleetdm Fleet, classified under OS Command Injection. CVSS score: 9.8/10. Published 2026-03-27.
How severe is CVE-2026-34387?: Critical severity. CVSS v3 base score is 9.8 out of 10.