GHSA-9vcr-g537-3w5v
Suggest an improvement- Source
- https://github.com/advisories/GHSA-9vcr-g537-3w5v
- Import Source
- https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/05/GHSA-9vcr-g537-3w5v/GHSA-9vcr-g537-3w5v.json
- JSON Data
- https://api.osv.dev/v1/vulns/GHSA-9vcr-g537-3w5v
- Aliases
-
- CVE-2026-26191
- Published
- 2026-05-14T13:17:36Z
- Modified
- 2026-05-16T00:06:04.189624Z
- Severity
-
- 6.0 (Medium) CVSS_V4 - 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 CVSS Calculator
- Summary
- Fleet vulnerable to OS command injection in software packages
- Details
-
Summary
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.
Impact
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.
Workarounds
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.
For more information
If you have any questions or comments about this advisory:
Email us at [security@fleetdm.com](mailto:security@fleetdm.com)
Join #fleet in [osquery Slack](https://join.slack.com/t/osquery/shared_invite/zt-h29zm0gk-s2DBtGUTW4CFel0f0IjTEw)
Credits
We thank @secfox-ai for responsibly reporting this issue.
- Database specific
{ "cwe_ids": [ "CWE-78" ], "severity": "MODERATE", "nvd_published_at": "2026-05-14T20:17:02Z", "github_reviewed": true, "github_reviewed_at": "2026-05-14T13:17:36Z" }- References
Affected packages
Go / github.com/fleetdm/fleet/v4
Package
- Name
- github.com/fleetdm/fleet/v4
- View open source insights on deps.dev
- Purl
- pkg:golang/github.com/fleetdm/fleet/v4