CVE-2026-34388: CWE-703: Improper Check or Handling of Exceptional Conditions in fleetdm fleet
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.
AI Analysis
Technical Summary
CVE-2026-34388 is a medium severity denial-of-service vulnerability in Fleet (an open source device management software) affecting versions before 4.81.0. The flaw arises from improper handling of exceptional conditions (CWE-703) in the gRPC Launcher endpoint, where an authenticated host can send an unexpected log type value that causes the server process to crash. This results in immediate termination of the Fleet server, interrupting all connected devices and services relying on it. The vulnerability has a CVSS 4.0 base score of 6.6 and requires authentication to exploit. The issue is fixed in Fleet version 4.81.0.
Potential Impact
Exploitation leads to a denial-of-service condition by crashing the Fleet server process, causing disruption to all connected hosts, mobile device management enrollments, and API consumers. This impacts availability of the Fleet service until the server is restarted or patched. No indication of privilege escalation or data compromise is provided.
Mitigation Recommendations
Upgrade Fleet to version 4.81.0 or later, where this vulnerability is patched. Since this is not a cloud service, users must apply the update themselves to remediate the issue. Patch status is confirmed by the vendor's versioning information.
CVE-2026-34388: CWE-703: Improper Check or Handling of Exceptional Conditions in fleetdm fleet
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.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-34388 is a medium severity denial-of-service vulnerability in Fleet (an open source device management software) affecting versions before 4.81.0. The flaw arises from improper handling of exceptional conditions (CWE-703) in the gRPC Launcher endpoint, where an authenticated host can send an unexpected log type value that causes the server process to crash. This results in immediate termination of the Fleet server, interrupting all connected devices and services relying on it. The vulnerability has a CVSS 4.0 base score of 6.6 and requires authentication to exploit. The issue is fixed in Fleet version 4.81.0.
Potential Impact
Exploitation leads to a denial-of-service condition by crashing the Fleet server process, causing disruption to all connected hosts, mobile device management enrollments, and API consumers. This impacts availability of the Fleet service until the server is restarted or patched. No indication of privilege escalation or data compromise is provided.
Mitigation Recommendations
Upgrade Fleet to version 4.81.0 or later, where this vulnerability is patched. Since this is not a cloud service, users must apply the update themselves to remediate the issue. Patch status is confirmed by the vendor's versioning information.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-03-27T13:45:29.619Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 69c6daaa3c064ed76fe814b5
Added to database: 3/27/2026, 7:29:46 PM
Last enriched: 4/4/2026, 10:55:26 AM
Last updated: 5/10/2026, 10:57:03 PM
Views: 91
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