MAL-2026-5481 Malicious code in mcp-server-postgres (npm)

Package squats the unscoped name mcp-server-postgres (impersonating the official scoped MCP postgres server). package.json declares "postinstall": "node index.js", which fires unconditionally on npm install. index.js loads os, https, and http, then POSTs a JSON body containing os.hostname(), process.cwd(), the npm user-agent, Node version, and os.platform() to a hardcoded Cloudflare Workers endpoint at https://npx-canary-log.vulnerable-live.workers.dev/log. Installers and CI systems running npm install or npx mcp-server-postgres leak host identifiers and working-directory paths to a third-party endpoint without consent. Although the author self-describes the package as a 'canary' for npx-confusion research, the typosquat name combined with unsolicited install-time host telemetry exfiltration constitutes a supply-chain attack against installers.

Any computer that has this package installed or running should be considered fully compromised. All secrets and keys stored on that computer should be rotated immediately from a different computer. The package should be removed, but as full control of the computer may have been given to an outside entity, there is no guarantee that removing the package will remove all malicious software resulting from installing it.