---
id: "CVE-2026-115751"
kind: "vulnerability"
aliases: ["CVE-2026-115751"]
title: "mcp-from-openapi: trailing-dot hostnames bypass SSRF blocklist"
severity: "medium"
cvss: 6.3
epss: null
exploited: false
status: "open"
category: "ai-tooling"
products: []
ecosystems: []
tags: ["ai-tooling", "mcp", "node", "openapi", "self-hosted"]
not_affected_if: ["default-config", "fixed-trusted-specs"]
published_at: "2026-10-23T13:17:09+00:00"
first_seen_at: "2026-10-23T21:57:33+00:00"
updated_at: "2026-10-25T04:00:03+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-115751", "first_seen_at": "2026-10-23T21:57:33+00:00"}]
---

# mcp-from-openapi: trailing-dot hostnames bypass SSRF blocklist

mcp-from-openapi, a tool that turns OpenAPI specs into MCP servers, has a server-side request forgery flaw in versions 2.2.0 before 2.9.0. An attacker who controls an OpenAPI spec URL or a redirect target can append a trailing dot to a blocked hostname to make the server fetch content from hosts the operator meant to block.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Check the installed version of `mcp-from-openapi` in each project's lockfile or `package.json`, looking for versions from `2.2.0` up to but not including `2.9.0`.
- Look for the `ssrf.blockedHosts` setting in your configuration to see whether you rely on the denylist.

## Fix

- Upgrade `mcp-from-openapi` to `2.9.0` or later.
- Until upgraded, do not load OpenAPI specs or follow redirects from untrusted sources.

## Timeline

- 2026-10-23T21:57:33+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-115751

## From the sources

Agentfront mcp-from-openapi from 2.2.0 before 2.9.0 contains a server-side request forgery vulnerability that allows attackers to bypass the ssrf.blockedHosts denylist using trailing-dot hostnames. Attackers who control an OpenAPI spec URL or redirect target can append a root dot to a blocked hostname to fetch content from operator-blocked hosts.

---

_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_