CVE-2026-34388 MEDIUM

CVE-2026-34388: Fleet vulnerable to Denial of Service via unhandled gRPC log type in launcher endpoint

Vendor Fleetdm
Product fleet
Weakness CWE-703
Published March 27, 2026
Last update March 31, 2026
View on NVD All CVEs

CVSS base score

6.6/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality —
Integrity —

CVSS vector

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

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

March 27, 2026 CVE published
March 31, 2026 Record updated