CVE-2026-34388

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

Published: Mar 27, 2026Updated: Apr 2, 2026 Sources: CVE List NVDCWE-703

NVD MITRE

7.5CVSSHIGH

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.

CVSS Vector Breakdown

Exploitability

AV:NAttack Vector

Network

AC:LAttack Complexity

Low

PR:NPrivileges Required

None

UI:NUser Interaction

None

Scope

S:UScope

Unchanged

Impact

C:NConfidentiality

None

I:NIntegrity

None

A:HAvailability

High

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Weaknesses

CWE-703

Affected Products

fleet fleetdm

SaaS

Enterprise Software / itsm-monitoring

fleetdmcommercialEnterprise Software

Exploitability

Official Patch Available

References

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

github.com

Timeline

Published

Mar 27, 2026

Last Updated

Apr 2, 2026

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