9.8

CVE-2026-34387: fleetdm fleet OS Command Injection

CVSS: 9.8v3.1CriticalAnalyzed
Published 27-03-2026Last modified 27-03-2026
Open JSON

Vulnerability summary

CVE-2026-34387 is a critical (CVSS 9.8) OS Command Injection vulnerability in fleetdm fleet. EPSS estimates a 1.85% chance of exploitation in the next 30 days, higher than 78.8% of scored vulnerabilities.

Overall risk
70/100
0100
High · default modelHow is this calculated?
CVSS score
9.8/10
010
Critical · v3.1 (NVD)
EPSS score
1.85%
0%100%
Low · +0.57 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 27-03-2026
    PublishedVulnerability first disclosed.
  2. 27-03-2026
    Last modifiedVulnerability information updated.

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.

CVSS metrics

3 scores · 2 sources · 2 versions

EPSS trend

Probability

1.85%

Chance of exploitation in the next 30 days

Percentile

79%

Versus all other CVEs

30-day change

+0.57 pp

From 1.28% on 20-09-2026

20-09-202620-10-2026
EPSS score
1.85%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Fleetdm1 product

1 vendor · 1 product

References

1 links