CVE-2026-34388

HIGH

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

Title source: cna

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.

References (1)

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

Scores

CVSS v3 7.5

EPSS 0.0006

EPSS Percentile 18.6%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CISA SSVC

Vulnrichment

Exploitation none

Automatable no

Technical Impact partial

Details

CWE

CWE-703

Status published

Products (2)

fleetdm/fleet < 4.81.0 (2 CPE variants)

fleetdm/fleet 0 - 4.81.0Go

Published Mar 27, 2026

Tracked Since Mar 29, 2026