CVE-2026-85620

Postgres MCP Pro 0.3.0 Restricted-Mode Bypass via FROM-Clause Function

9.2 Critical

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.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None

What an attacker can affect

Confidentiality: High
Integrity: None
Availability: None

Exploit likelihood

0.51%Up 0.1 points since Sep 5, 2026

What each source reports

CVE List Score used9.2

Postgres MCP Pro 0.3.0 Restricted-Mode Bypass via FROM-Clause Function

Record: CVE-2026-85620
CVSS 4.0: 9.2 CriticalCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N
CVSS 3.1: 8.6 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N
Weakness: CWE-863
Updated: 2026-11-02

EUVDEUVD-2026-712279.2

Record: EUVD-2026-71227
CVSS 4.0: 9.2 CriticalCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N
Updated: 2026-11-02

GitHub AdvisoriesGHSA-cm87-gp55-7cgj9.2

Postgres MCP Pro 0.3.0 contains a restricted-mode bypass vulnerability where function-name...

Record: GHSA-cm87-gp55-7cgj
CVSS 4.0: 9.2 CriticalCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS 3.1: 8.6 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N
Weakness: CWE-863
Updated: 2026-11-02

NVD9.2

Record: CVE-2026-85620
CVSS 4.0: 9.2 CriticalCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS 3.1: 8.6 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N
Weakness: CWE-863
Updated: 2026-11-02

OSV9.2

Postgres MCP Pro 0.3.0 Restricted-Mode Bypass via FROM-Clause Function

Record: CVE-2026-85620
CVSS 4.0: 9.2 CriticalCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N
Weakness: CWE-863
Updated: 2026-11-02

Affected products

crystaldba postgres-mcp

History

History
Recorded	Changed	Sources
Nov 2, 2026	first indexed	CVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-85620 is a critical vulnerability (CVSS 9.2) in Crystaldba Postgres-mcp, published September 4, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.51%, the 43rd percentile. No source names a fixed version.