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CVE-2026-101045

Fleet Homebrew Cask OS Command Injection via Metadata

HIGH
8
CVSS Score
Published: September 27, 2026 at 05:02 PM UTC
Updated: September 30, 2026 at 06:18 PM UTC
1 product affected across 1 vendorFleet

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Severity
HIGH8
Exploit prediction
EPSS 0.8%
SSVC
No known exploit

Description

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Fleet· Fleetdmnpm
60%
v < 2026-08-19
Affected range stops below 2026-08-19, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (2)

Vendor Advisory
Source: cverecord
https://github.com/fleetdm/fleet/security/advisories/GHSA-fv3p-h7wv-2jgm
Third Party Advisory
Source: cverecord
https://www.vulncheck.com/advisories/fleet-homebrew-cask-os-command-injection-via-metadata

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8HIGHVulnCheck
Attack Vector
NETWORK
Complexity
HIGH
Privileges
HIGH
User Interaction
NONE
Scope
CHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusAWAITING ANALYSIS
CWE
CWE-78

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