Detections
Analytics

SCA: security update for github.com/fleetdm/fleet/v4 (GHSA-9vcr-g537-3w5v)

medium Tenable Self-Hosted Container Security Plugin ID 441838

Description

There are packages installed that are affected by a vulnerability referenced in the following CVE:

 - 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. (CVE-2026-26191)

Solution

Update the github.com/fleetdm/fleet/v4 library and its related packages to version 4.81.1 or later.

See Also

https://github.com/advisories/GHSA-9vcr-g537-3w5v

Plugin Details

Severity: Medium

ID: 441838

Version: Revision 1.7

Type: Local

Family: SCA Checks

Published: 5/14/2026

Updated: 6/2/2026

Supported Sensors: Tenable Cloud Security, Tenable Self-Hosted Container Security

Risk Information

VPR

Risk Factor: Medium

Score: 4.9

Percentile: 57.87

Vendor

Vendor Severity: Medium

CVSS v2

Risk Factor: Critical

Base Score: 10

Temporal Score: 7.4

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C

CVSS Score Source: CVE-2026-26191

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Temporal Score: 8.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

CVSS v4

Risk Factor: Medium

Base Score: 6

Threat Score: 2.3

Threat Vector: CVSS:4.0/E:U

Vector: 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

Vulnerability Information

Exploit Ease: No known exploits are available

Patch Publication Date: 5/14/2026

Vulnerability Publication Date: 5/14/2026

Reference Information

CVE: CVE-2026-26191

cwe: CWE-78