What is CVE-2026-34388?

CVE-2026-34388 is a high-severity vulnerability in Fleetdm Fleet, classified under CWE-703. CVSS score: 7.5/10. Published 2026-03-27.

How severe is CVE-2026-34388?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Fleetdm Fleet

CVE-2026-34388

Fleet is open source device management software. Prior to 4.81.0, a denial-of-service vulnerability in Fleet's gRPC Launcher endpoint allows an authenticated host to crash the entire Fleet server process by sending an unexpected log type value. The server terminates immediately, disrupting all connected hosts, MDM enrollments, and API consumers. Version 4.81.0 patches the issue.

EPSS: 0.003 (17.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Fleetdm Fleet — versions < 4.81.0

Weakness classification (CWE)

CWE-703

References

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

Frequently asked questions

What is CVE-2026-34388?: CVE-2026-34388 is a high-severity vulnerability in Fleetdm Fleet, classified under CWE-703. CVSS score: 7.5/10. Published 2026-03-27.
How severe is CVE-2026-34388?: High severity. CVSS v3 base score is 7.5 out of 10.