CVE-2026-34388

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

CVSS 6.6 MEDIUMEPSS 0.3%CWE-703

Vexday Risk Score

13Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS 6.6EPSS 0.3%KEV nãoPoC —Nuclei —Metasploit —Patch —

Lifecycle

27 Mar 2026Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

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: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

Affected products

fleetdm · fleet

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References

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