What’s Vulnerable › Vulnerabilities

CVE-2026-85620: Postgres MCP Pro 0.3.0 Restricted-Mode Bypass via FROM-Clause Function

• Severity: high (CVSS 8.6 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-04 · updated 2026-09-24
• Weakness: CWE-863

Description

Postgres MCP Pro 0.3.0 contains a restricted-mode bypass vulnerability where function-name validation is not applied to RangeFunction nodes in FROM clauses. Attackers can execute file-reading functions like pg_read_file through FROM-clause syntax to read arbitrary files despite restricted-mode protections.

Affected products

• crystaldba postgres-mcp: through 0.3.0

References

• https://github.com/crystaldba/postgres-mcp
• https://github.com/crystaldba/postgres-mcp/blob/v0.3.0/src/postgres_mcp/sql/safe_sql.py
• https://github.com/crystaldba/postgres-mcp/issues/178
• https://www.vulncheck.com/advisories/postgres-mcp-pro-0.3.0-restricted-mode-bypass-via-from-clause-function

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