CVE-2026-16658

A flaw was found in the community.proxmox Ansible collection's proxmox_pct_remote connection plugin. The _build_pct_command() method constructs a pct exec command string using unquoted string concatenation and passes it to the Proxmox host's shell via Paramiko. Shell metacharacters in the command (such as >, |, ;, &&, or $()) are interpreted on the host instead of inside the target LXC container, allowing commands intended for an unprivileged container to execute on the hypervisor host as root. This constitutes a container-to-host trust boundary crossing. The put_file and fetch_file methods in the same plugin correctly use shell quoting, indicating this is an oversight on the exec path.