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Is PostgreSQL MCP server safe?

What PostgreSQL MCP server does

This server gives an MCP client read-only access to a PostgreSQL database: it exposes table schemas as resources and offers a query tool that runs SQL inside a READ ONLY transaction. The npm author field lists Anthropic, PBC, and npm marks the package as no longer supported. It takes a PostgreSQL connection string as a command-line argument, so the credentials in that string decide what can be read. Before installing, connect with a dedicated database role limited to the schemas you want the model to see, not an owner or superuser account.

No malicious indicators - review capabilities before installing
Notable — review in context (a capability is not a malicious indicator):
  • npm prepare hook
  • MCP tool surface detected

What to do: Nothing here argues against installing it. Grant the capabilities it lists only if you expect the tool to need them.

PostgreSQL MCP server is an MCP server analyzed by SkillTotal's deterministic static scanner. The scan found no malicious indicators. It can: install time execution and mcp tools detected — capabilities are what the code can do, not a verdict on intent. Risk score 0/100 (low).

@modelcontextprotocol/server-postgres 0.6.2

npm package · npm:@modelcontextprotocol/server-postgres
LOW
0
/ 100 risk score
Snapshot · scanned Nov 13, 2026 · @modelcontextprotocol/server-postgres@0.6.2 · engine 1.1.0 / ruleset 100

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Automated static-analysis result. It can contain false positives and false negatives, and is not a claim about the intent of PostgreSQL MCP server's authors. Report a false positive.

Capabilities — what this component can do (not a risk score):
install time executionmcp tools detected

Behavioral traits

How this component maps to the CSA agentic threat model. Descriptive — it never affects the risk score.

Tool surface
Tool Usage
Supply-chain provenance risk
General Protections / Supply Chain

Findings (2)

Capabilitynpm prepare hooknot scored · severity mediumST-INSTALL-NPM-PREPARE

package.json has a 'prepare' script (runs on git/local installs and before publishing).

package.json:18 
"prepare": "npm run build",

Why it matters: Usually a build step, but confirm it doesn't fetch or run remote code.

Fix: Usually a legitimate build step; confirm it only builds and does not fetch or execute remote code.

CapabilityMCP tool surface detectednot scored · severity lowST-MCP-DETECTED

An MCP tool surface (manifest or tool definitions) was found.

dist/index.js:6 
const server = new Server({
dist/index.js:69 
server.setRequestHandler(ListToolsRequestSchema, async () => {
dist/index.js:85 
server.setRequestHandler(CallToolRequestSchema, async (request) => {
dist/index.js:110 
const transport = new StdioServerTransport();

Why it matters: Just context — review which tools it offers and their permissions.

Fix: Review the declared MCP tools and their permissions.

How attackers abuse these capabilities

Interactive labs on the attack class behind the rules above. They show the technique, not anything found in PostgreSQL MCP server.

Maintain PostgreSQL MCP server?

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How we determine this: deterministic static analysis (regex + AST), evidence-anchored, no code execution. Methodology →