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Vulnerability details: VCID-r1k8-zrdp-2fdz
Vulnerability ID VCID-r1k8-zrdp-2fdz
Aliases CVE-2026-34388
GHSA-w254-4hp5-7cvv
Summary 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.
Status Published
Exploitability None
Weighted Severity None
Risk None
Affected and Fixed Packages Package Details
Weaknesses (1)
CWE-703 Improper Check or Handling of Exceptional Conditions
System Score Found at
epss 0.00063 https://api.first.org/data/v1/epss?cve=CVE-2026-34388
epss 0.00063 https://api.first.org/data/v1/epss?cve=CVE-2026-34388
epss 0.00063 https://api.first.org/data/v1/epss?cve=CVE-2026-34388
cvssv4 6.6 https://github.com/fleetdm/fleet
generic_textual MODERATE https://github.com/fleetdm/fleet
cvssv4 6.6 https://github.com/fleetdm/fleet/security/advisories/GHSA-w254-4hp5-7cvv
generic_textual MODERATE https://github.com/fleetdm/fleet/security/advisories/GHSA-w254-4hp5-7cvv
ssvc Track https://github.com/fleetdm/fleet/security/advisories/GHSA-w254-4hp5-7cvv
cvssv4 6.6 https://nvd.nist.gov/vuln/detail/CVE-2026-34388
generic_textual MODERATE https://nvd.nist.gov/vuln/detail/CVE-2026-34388
Reference id Reference type URL
https://api.first.org/data/v1/epss?cve=CVE-2026-34388
https://github.com/fleetdm/fleet
https://nvd.nist.gov/vuln/detail/CVE-2026-34388
GHSA-w254-4hp5-7cvv https://github.com/fleetdm/fleet/security/advisories/GHSA-w254-4hp5-7cvv
No exploits are available.
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 Found at https://github.com/fleetdm/fleet
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

network

adjacent

local

physical

low

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present

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passive

active

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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 Found at https://github.com/fleetdm/fleet/security/advisories/GHSA-w254-4hp5-7cvv
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

network

adjacent

local

physical

low

high

none

present

none

low

high

none

passive

active

high

low

none

high

low

none

high

low

none

high

low

none

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Vector: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2026-03-31T13:43:45Z/ Found at https://github.com/fleetdm/fleet/security/advisories/GHSA-w254-4hp5-7cvv
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 Found at https://nvd.nist.gov/vuln/detail/CVE-2026-34388
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

network

adjacent

local

physical

low

high

none

present

none

low

high

none

passive

active

high

low

none

high

low

none

high

low

none

high

low

none

high

low

none

high

low

none
Exploit Prediction Scoring System (EPSS)
Percentile 0.19858
EPSS Score 0.00063
Published At June 11, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-06-11T16:47:20.345497+00:00 Vulnrichment Import https://github.com/cisagov/vulnrichment/blob/develop/2026/34xxx/CVE-2026-34388.json 38.6.0