---
id: CVE-2026-81095
title: >-
  pg-aiguide started its MCP HTTP transport without enabling the host allow-list
  the underlying SDK provides
summary: >-
  pg-aiguide started its MCP HTTP transport without enabling the host allow-list
  the underlying SDK provides. src/httpServer.ts called the shared
  httpServerFactory helper and never set the DNS-rebinding-protection option, so
  the transport …
severity: medium
cvss: 6.8
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N'
cwe:
  - CWE-346
published: '2026-08-27'
updated: '2026-09-23'
sourceUpdated: '2026-09-23T17:17:43.430'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-81095'
references:
  - url: 'https://github.com/timescale/pg-aiguide'
    label: disclosure@vulncheck.com
  - url: 'https://github.com/timescale/pg-aiguide/pull/121'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/timescale-pg-aiguide-through-0.5.0-dns-rebinding-via-disabled-host-header-allow-list
    label: disclosure@vulncheck.com
tags:
  - nvd
epss: 0.0016
epssPercentile: 0.05618
ingestedAt: '2026-08-29T21:42:35.198Z'
---

## Overview

pg-aiguide started its MCP HTTP transport without enabling the host allow-list the underlying SDK provides. src/httpServer.ts called the shared httpServerFactory helper and never set the DNS-rebinding-protection option, so the transport accepted a request whatever host it named. A page in a browser could therefore point a name it controlled at the address the server was bound to and drive the locally reachable MCP server through the visitor's browser. The protection was already available in the packaged transport and simply not turned on, so updating the dependency alone would not have closed it. Version 0.5.1 passes the option explicitly.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.