CVE-2026-126197

pgEdge Postgres MCP Server enables SQL queries against PostgreSQL databases through Model Context Protocol compatible clients. Prior to 1.1.0, custom pl-do tools interpolated JSON arguments into a PostgreSQL DO block delimited by fixed dollar-quote tags. An argument containing $mcp_custom_tool$ could terminate the block and inject arbitrary SQL statements, while $mcp_args$ could inject procedural code into a plpgsql block. Because the statement used the simple query protocol, injected text could include additional statements and transaction control, bypassing read_only and accessing data or modifying resources available to the connecting role. The issue requires at least one pl-do custom tool; sql and pl-func tools pass arguments as bind parameters and are not affected by this injection mechanism. This issue is fixed in 1.1.0.

• CWE-89

• https://github.com/pgEdge/pgedge-postgres-mcp/commit/b5b929305de7a22cd6ed7de8ae1be2ac90ca0868
• https://github.com/pgEdge/pgedge-postgres-mcp/pull/196
• https://github.com/pgEdge/pgedge-postgres-mcp/releases/tag/v1.1.0
• https://github.com/pgEdge/pgedge-postgres-mcp/security/advisories/GHSA-r5pp-jx86-r6r9

Published

Nov 12, 2026

Last Modified

Nov 12, 2026

Status

Awaiting Analysis

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