CVE-2026-34387: Fleet is open source device management software

Q: How do I fix CVE-2026-34387?

fleet: upgrade to 4.81.1. Exact commands for each OS are on this page.

Q: Is CVE-2026-34387 being exploited?

CVE-2026-34387 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-34387 affect?

CVE-2026-34387 affects fleet. Severity is critical (CVSS 9.8). 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 m

Q: How urgent is CVE-2026-34387?

Priority 57/100. Critical severity; Remotely exploitable, no login, no user action

This month

CRITICAL 9.8REMOTEUPGRADE

CVE-2026-34387 is a critical-severity flaw (CVSS 9.8) affecting fleet. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

Critical severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.3% (top 29%)
CISA exploited list	No
Weakness	CWE-78
Published	2026-03-27
Last modified	2026-10-26

Publisher (CNA): GitHub, Inc. · Vendor: fleetdm

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-03-27 19:16 UTCPublished CVE record published
2026-10-26 22:10 UTCUpdated Record last modified

fleetdm fleet UPGRADE

Affected: < 4.81.1

Fixed in: 4.81.1

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy fleet || rpm -q fleet || fleet --version

2. UPGRADE to 4.81.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade fleet

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade fleet

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Exact fixes by distribution

Fedora ELN · openbao · FIXED · 2.6.5-1.eln159 · FEDORA-2026-77adf886ae · source

sudo dnf upgrade --advisory=FEDORA-2026-77adf886ae

Fedora 46 · sugar-turtleart · FIXED · 220-16.fc46 · FEDORA-2026-b79483c788 · source

sudo dnf upgrade --advisory=FEDORA-2026-b79483c788

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-34387?

fleet: upgrade to 4.81.1. Exact commands for each OS are on this page.

Is CVE-2026-34387 being exploited?

CVE-2026-34387 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-34387 affect?

CVE-2026-34387 affects fleet. Severity is critical (CVSS 9.8). 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 m

How urgent is CVE-2026-34387?

Priority 57/100. Critical severity; Remotely exploitable, no login, no user action

Software pages

Windows vulnerabilities · macOS vulnerabilities

Related CVEs

CVE-2026-29180 HIGH 8.8 UPGRADE Fleet is open source device management software
CVE-2026-34386 HIGH 8.8 UPGRADE Fleet is open source device management software
CVE-2026-34391 HIGH 7.5 UPGRADE Fleet is open source device management software
CVE-2026-34385 HIGH 8.1 UPGRADE Fleet is open source device management software
CVE-2026-26061 HIGH 7.5 UPGRADE Fleet is open source device management software

References

← Back to latest CVEs