---
id: CVE-2026-81102
title: >-
  The Dash MCP server bound its listener to the loopback address but never
  checked the host a request named
summary: >-
  The Dash MCP server bound its listener to the loopback address but never
  checked the host a request named. src/mcp_server_dash.py constructed the
  server for its network mode with the interface restricted to loopback and no
  transport-secu…
severity: low
cvss: 3.1
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N'
cwe:
  - CWE-346
published: '2026-08-27'
updated: '2026-09-24'
sourceUpdated: '2026-09-24T20:43:32.537'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-81102'
references:
  - url: 'https://github.com/dropbox/mcp-server-dash'
    label: disclosure@vulncheck.com
  - url: 'https://github.com/dropbox/mcp-server-dash/pull/12'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/dropbox-dash-mcp-server-dns-rebinding-via-missing-host-header-validation
    label: disclosure@vulncheck.com
tags:
  - nvd
epss: 0.00183
epssPercentile: 0.06993
ingestedAt: '2026-09-24T20:51:40.236Z'
---

## Overview

The Dash MCP server bound its listener to the loopback address but never checked the host a request named. src/mcp_server_dash.py constructed the server for its network mode with the interface restricted to loopback and no transport-security settings, so a name that had been pointed at the loopback address still reached the listener while carrying the attacker's host name. A page in a visitor's browser could therefore drive the local server and invoke its company-search and file-detail tools under the Dropbox credential the server holds. Only the network mode was reachable this way; the standard input mode was not. The fix supplies transport-security settings that enable host checking and allow only the loopback name and port, rejecting other hosts before a tool runs. The repository publishes no versions, so the affected boundary is the commit preceding the fix.

## Remediation

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