Is CVE-2026-26191 actively exploited?

No active exploitation of CVE-2026-26191 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-26191 be exploited remotely?

Yes. CVE-2026-26191 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-26191?

CVE-2026-26191 has a CVSS score of 9.8 (CRITICAL).

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CRITICAL

CVE-2026-26191

CWE-78Published: May 14, 2026· Updated: May 18, 2026

9.8

CVSS v3.1

EPSS:0.06%probability of exploitation in 30 daysPercentile:19.8th

Official Description

Fleet is open source device management software. Prior to version 4.81.0, 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. 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. Version 4.81.0 contains a patch. 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.

NVD Source

Technical Analysis

CVE-2026-26191 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.