CVE-2026-101045
published 2026-09-27CVE-2026-101045: Fleet-maintained app install and uninstall scripts for macOS are generated from Homebrew cask metadata. In manifests generated before 2026-08-19, the script…
PriorityP349high8CVSS 3.1
AVNACHPRHUINSCCHIHAH
EPSS
0.75%
53.4th percentile
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.
Affected
1 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| fleetdm | fleet | < 2026-08-19 | 2026-08-19 |
CVSS provenance
nvdv3.18.0HIGHCVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H
nvdv4.08.9HIGHCVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
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VulDB
FleetDM Fleet up to 4.91.0 Manifest Generator os command injection
vuldb·2026-09-27·CVSS 8.0
CVE-2026-101045 [HIGH] FleetDM Fleet up to 4.91.0 Manifest Generator os command injection
A vulnerability labeled as very critical has been found in FleetDM Fleet up to 4.91.0. Affected by this vulnerability is an unknown functionality of the component Manifest Generator. Executing a manipulation can lead to os command injection.
This vulnerability appears as CVE-2026-101045. The attack may be performed from remote. There is no available exploit.
The affected component should be upgraded.
GHSA
Fleet-maintained app install and uninstall scripts for macOS are generated from Homebrew cask metadata.
ghsa_unreviewed·2026-09-27
CVE-2026-101045 [HIGH] CWE-78 Fleet-maintained app install and uninstall scripts for macOS are generated from Homebrew cask metadata.
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. T
No detection rules found.
No public exploits indexed.
No writeups or analysis indexed.
2026-09-27
Published