CVE-2026-101045

What it is

Fleet-maintained app install and uninstall scripts for macOS are generated from Homebrew cask metadata. In manifests generated before 2026-08-19, the script generator escaped this metadata at some interpolation sites but not all of them, so cask metadata containing shell metacharacters (for example $(...) command substitution) could be carried into scripts that execute as root on managed macOS hosts. An attacker who could land crafted metadata in an upstream Homebrew cask — without needing any Fleet credentials — could achieve arbitrary command execution as root on managed macOS hosts that install or uninstall the affected Fleet-maintained app; exploitation required the crafted metadata to pass both upstream Homebrew cask review and Fleet's review of the automated ingestion pull request. The fix (fleetdm/fleet#51324) landed in Fleet's ingestion pipeline on 2026-08-19 so that all manifests generated on or after that date escape cask metadata at every interpolation site; because manifests are generated centrally and distributed as pre-built content, remediation applied to all deployments with no customer action, and the code fix is included in Fleet v4.92.0.

At a glance

Exploitability

Can be exploited over the network with an admin-level account. High risk of data exposure, data tampering, service disruption.

Exploit odds

0.8% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2026-09-27 18:16 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-09-30 18:18 UTC Last updatedMost recent change to the record

Details

Published

2026-09-27 18:16 UTC

Last modified

2026-09-30 18:18 UTC

Exploit probability

0.8% · EPSS, next 30 days

Weakness

CWE-78 · OS command injection

Record status

Awaiting Analysis

Attack profile CVSS 4.0 · 8.9

Attack vector

Network

Complexity

High

Attack requirements

Present

Privileges needed

High

User interaction

None

Confidentiality

High

Integrity

High

Availability

High