CVE-2026-34388
High
Description
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.
SeverityHigh
CVSS7.5
Exploit probability—
ProductFleet
PublishedMar 27, 2026
First seenMar 27, 2026
Weakness typeCWE-703CWE-703
How to fix
Update
- fleetdm fleet4.81.0 or later
- github.com/fleetdm/fleet/v44.81.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| fleetdm fleet | v < 4.81.0 | 4.81.0 |
| github.com/fleetdm/fleet/v4Go | v < 4.81.0 | 4.81.0 |
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