Critical severity · published Mar 27, 2026
CVE-2026-34387
Fleet vulnerable to OS command injection via crafted software package metadata in uninstall scripts
9.8
CVSS
1.3%
EPSS
No
On KEV
Description
Fleet is open source device management software. Prior to 4.81.1, a command injection vulnerability in Fleet's software installer pipeline allows an attacker to achieve arbitrary code execution as root (macOS/Linux) or SYSTEM (Windows) on managed hosts when an uninstall is triggered for a crafted software package. Version 4.81.1 patches the issue.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.3% · higher than 71% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
FL
fleet · fleetdm
< 4.81.1 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-34387
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-34387
Vendor Advisory
https://github.com/fleetdm/fleet/security/advisories/GHSA-7rhw-5mpv-gp4h
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