pgEdge Postgres MCP Server login rate limiting can be evaded by a caller-supplied header

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-125321
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-11-10 18:17:33 UTC
Updated2026-11-10 18:17:33 UTC
DescriptionpgEdge Postgres MCP Server enables SQL queries against PostgreSQL databases through Model Context Protocol compatible clients. Prior to 1.1.0, deployments exposing the nondefault HTTP transport with authentication enabled used the leftmost caller-supplied X-Forwarded-For value as the client address for login rate limiting. ExtractIPAddress in internal/auth/middleware.go supplied that value to IsAllowed and RecordFailedAttempt in internal/auth/rate_limiter.go, allowing an unauthenticated caller to rotate addresses to evade throttling or assert another user's address to consume that user's limiter bucket. The published nginx configuration appended rather than replaced X-Forwarded-For, making the issue reachable without an operator misconfiguration. Username-keyed account lockout did not use the client address, but shipped defaults disabled that separate control through MaxFailedAttemptsBeforeLockout: 0. This issue is fixed in version 1.1.0.

Risk And Classification

Primary CVSS: v3.1 6.5 MEDIUM from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L

Problem Types: CWE-770 | CWE-807 | CWE-770 CWE-770: Allocation of Resources Without Limits or Throttling | CWE-807 CWE-807: Reliance on Untrusted Inputs in a Security Decision

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary6.5MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L
3.1CNADECLARED6.5MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
Low

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA PgEdge Pgedge-postgres-mcp affected < 1.1.0 Not specified

References

ReferenceSourceLinkTags
github.com/pgEdge/pgedge-postgres-mcp/security/advisories/GHSA-v347-v3w7... [email protected] github.com
github.com/pgEdge/pgedge-postgres-mcp/issues/204 [email protected] github.com
github.com/pgEdge/pgedge-postgres-mcp/pull/205 [email protected] github.com
github.com/pgEdge/pgedge-postgres-mcp/commit/6a19e46a240b9f4661a4a253811... [email protected] github.com
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