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CVE-2026-26191— Fleet vulnerable to OS command injection in software packages

Quick assessment

Affected
fleetdm fleet
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Fleet是Fleet Device Management开源的一个设备管理平台，支持多种操作系统和设备，帮助 IT 和安全团队进行设备管理、漏洞报告、MDM 等操作。 Fleet 4.81.0之前版本存在操作系统命令注入漏洞，该漏洞源于软件安装程序管道中元数据清理不当，可能导致特制软件包在触发卸载时在受管端点上以root或SYSTEM权限执行任意命令。

AI Predicted 8.1 Difficulty: Moderate EPSS 0.94% · P60

Affected Version Matrix 1

VendorProduct Version RangeStatus
fleetdm fleet < 4.81.1 affected
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I. Basic Information for CVE-2026-26191

Vulnerability Information
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Vulnerability Title
Fleet vulnerable to OS command injection in software packages
Source: CVE Program / CVE List V5
Vulnerability Description
Fleet is open source device management software. Prior to version 4.81.0, a vulnerability in Fleet's software installer pipeline could allow a crafted software package to execute arbitrary commands as root (macOS/Linux) or SYSTEM (Windows) on managed endpoints when an uninstall is triggered. When a software package (.pkg, .deb, .rpm, .exe, or .msi) is uploaded to Fleet, metadata is extracted from the package binary and used to generate uninstall scripts. In affected versions, this metadata is not properly sanitized before being included in the generated scripts. A specially crafted package containing malicious values in its metadata fields could result in unintended command execution when the uninstall script runs on managed endpoints. Version 4.81.0 contains a patch. If an immediate upgrade is not possible, administrators should avoid uploading software packages obtained from untrusted or unverified sources. Additionally, administrators can manually inspect and edit auto-generated uninstall scripts before deployment.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
OS命令中使用的特殊元素转义处理不恰当(OS命令注入)
Source: CVE Program / CVE List V5
Vulnerability Title
Fleet 操作系统命令注入漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Fleet是Fleet Device Management开源的一个设备管理平台，支持多种操作系统和设备，帮助 IT 和安全团队进行设备管理、漏洞报告、MDM 等操作。 Fleet 4.81.0之前版本存在操作系统命令注入漏洞，该漏洞源于软件安装程序管道中元数据清理不当，可能导致特制软件包在触发卸载时在受管端点上以root或SYSTEM权限执行任意命令。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
fleetdm fleet < 4.81.1 -

II. Public POCs for CVE-2026-26191

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III. Intelligence Information for CVE-2026-26191

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Vendor Advisories for CVE-2026-26191 (1)

Vendor Pages for CVE-2026-26191 (1)

Same Patch Batch · fleetdm · 2026-05-14 · 6 CVEs total

CVE-2026-26062 Fleet server may terminate unexpectedly when handling certain gRPC requests
CVE-2026-24000 Fleet has a rate limiting bypass via untrusted client IP headers
CVE-2026-24899 Fleet Windows MDM Azure AD JWT Authentication Bypass
CVE-2026-46356 Fleet: IP spoofing allows bypassing API rate limiting
CVE-2026-23998 Fleet has a Windows MDM management endpoint authentication bypass

IV. Related Vulnerabilities

Same product: fleet
Same vendor: fleetdm
Same weakness: CWE-78

V. Comments for CVE-2026-26191

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