CVE-2026-87911: AWS AWS Labs postgres MCP Server

Read-only enforcement bypass enabling operating system command execution in the SQL validation component of Amazon awslabs postgres-mcp-server

CVSS 9.0 CriticalCriticalEPSS 0.017 · 77th percentile

Critical, because:

CVSS score 9.0: 9.0 or more.

How we decide what’s critical

Published by the CVE Program (CNA: AMZN) at 9 Sept 2026, 19:35 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

Affected products, as the CNA wrote them
Vendor	Product	Versions
AWS	AWS Labs postgres MCP Server	affected before 1.1.7 custom Other versions: unaffected

Identifiers

CVE-2026-87911

CNA

AMZN

Weakness (CWE)

CWE-78 · CWE-184

Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
9.6	Critical	3.1	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H	CNA (AMZN)
9.0	Critical	4.0	CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H	CNA (AMZN)Used for this record

CISA KEV Not listed.
EPSS 0.017, the 77th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

This record came from the full history of the CVE Program, published 9 Sept 2026. New records show when each source confirmed them.

Sources

References from the CNA

pypi.org/project/awslabs.postgres-mcp-server/1.1.7/ patch
aws.amazon.com/security/security-bulletins/2026-104-aws/ vendor-advisory
github.com/awslabs/mcp/security/advisories/GHSA-fph8-pg5w-78fv third-party-advisory

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.