CVE-2026-34388

Fleet vulnerable to Denial of Service via unhandled gRPC log type in launcher endpoint

State: Published
Severity: 6.6 Medium
Published: Mar 27, 2026
Updated: Mar 31, 2026
Reserved: Mar 27, 2026

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.

Scores

CVSS	Score	Vector	Source
4.0	6.6 Medium	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U	GitHub_M

Weaknesses

CWE-703 Improper Check or Handling of Exceptional Conditions

Affected Products

Product	Versions
fleetfleetdm	< 4.81.0Affected

References

https://github.com/fleetdm/fleet/security/advisories/GHSA-w254-4hp5-7cvv

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