{"schema_version": "1.6.1", "id": "CVE-2026-50112", "summary": "RCE and SSRF in direct download, metalink and NFS templates", "details": "SSRF via Metalink Mirror URL Resolution:\n\nAn authenticated tenant can register a template pointing to an attacker-controlled metalink file containing internal targets. The Secondary Storage VM will retrieve the data and persist it as a template file, which can later be downloaded through normal APIs.\n\nRCE on KVM hypervisor via NFS, Metalink files with/without Direct Downloads:\n\nAn authenticated CloudStack tenant holding the default User role can execute arbitrary shell commands as root on the KVM hypervisor host that runs other tenants' VMs. This is cross-tenant root on the underlying compute, reachable via the public CloudStack API.\n\n\nWhen a User registers a VM template with directDownload=true and a URL pointing to a .metalink file, the management server fetches the metalink XML and dispatches download to the KVM agent. Inner URLs inside the metalink XML are never re-validated against the scheme allowlist.\n\n\nThese issues affect Apache CloudStack: from 4.14.0.0 through 4.20.3.0 and from 4.21.0.0 through 4.22.1.0.\n\nUsers are recommended to upgrade to version 4.20.3.1 or 4.22.1.1 or later, which fixes the issue.", "affected": [{"ranges": [{"type": "SEMVER", "events": [{"introduced": "4.14.0.0"}, {"last_affected": "4.14.0.0"}]}, {"type": "SEMVER", "events": [{"introduced": "4.21.0.0"}, {"last_affected": "4.21.0.0"}]}]}], "references": [{"type": "WEB", "url": "https://lists.apache.org/thread/g6cwddtjrwbh1d56wjz4cfp3fzfm4kbc"}]}