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Advisory record · GHSA-9vcr-g537-3w5v

Fleet vulnerable to OS command injection in software packages

CVSS 6.0 MediumEPSS 0.0077 · 56th percentile

Published by the GitHub Advisory Database at 14 May 2026, 13:17 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
github.com/fleetdm/fleet/v4Go<4.81.14.81.1
Identifiers
GHSA-9vcr-g537-3w5v · CVE-2026-26191 · GO-2026-5301
Weakness (CWE)
CWE-78
Tags
Published
14 May 2026
Updated
25 Jun 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Fleet (github.com/fleetdm/fleet/v4) versions before 4.81.1 are vulnerable to OS command injection. An attacker who can supply a crafted software package, such as one with malicious metadata, could get arbitrary commands run as root or SYSTEM on managed endpoints when an uninstall is triggered. Upgrade to Fleet 4.81.1 or later; until then, avoid uploading packages from untrusted sources and review auto-generated uninstall scripts before deploying them.

Written 7 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
6.0 Medium 4.0 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 CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0077, the 56th percentile, on 15 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 15:07 UTC First seen by agentprime
  2. 31 Oct 2026, 15:07 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.