{"schema":"threatline.record/2","record":{"id":"CVE-2026-101045","aliases":["GHSA-fv3p-h7wv-2jgm"],"summary":"Fleet Homebrew Cask OS Command Injection via Metadata","details":"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.","categories":["Unclassified"],"product":"fleet","vendor":"fleetdm","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-101045","source_modified_at":"2026-09-30T17:20:13.569Z","fetched_at":"2026-10-23T18:52:38.922436Z","product":"fleet","vendor":"fleetdm","versions":[{"version":"0","status":"affected","versionType":"custom","lessThan":"2026-08-19"}],"defaultStatus":"unaffected"}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-101045","source_modified_at":"2026-09-30T17:20:13.569Z","fetched_at":"2026-10-23T18:52:38.922436Z","package":{"name":"fleet","ecosystem":null},"version":"2026-08-19","basis":"first unaffected version stated in the CVE record"}],"cvss":8.9,"severity":"High","kev":{"listed":false},"epss":{"probability":0.0075,"percentile":0.5448,"score_date":"2026-10-23"},"published_at":"2026-09-27T17:02:34.472Z","modified_at":"2026-09-30T17:20:13.569Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-101045","fetched_at":"2026-10-23T18:52:38.922436Z","source_modified_at":"2026-09-30T17:20:13.569Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-101045","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","EPSS"],"references":[{"source":"CVE List","url":"https://github.com/fleetdm/fleet/security/advisories/GHSA-fv3p-h7wv-2jgm","tags":["vendor-advisory"]},{"source":"CVE List","url":"https://www.vulncheck.com/advisories/fleet-homebrew-cask-os-command-injection-via-metadata","tags":["third-party-advisory"]}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CVE List","ssvc":{"exploitation":"none","automatable":"no","technical_impact":"total","assessed_at":"2026-09-28T14:11:11.667554Z"},"classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":null,"confidence":"unknown","reviewed":false},"change_timestamp":"2026-09-30T17:20:13.569Z","content_hash":"17b170c2f6856e956ac9b907e4fcec34ea36ecc065ac8ceb9251ee7f7b41bc74"}}