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archive/Patch now/AIR-2026-1331
closedclosed 4 Sep 2026Patch now2 Disclosed vulnerabilityAI

CVE-2026-9186: IBM Langflow OSS localhost MCP configuration bypass

Langflow

An IP spoofing vulnerability in IBM Langflow OSS allows remote authenticated attackers to bypass localhost restrictions and modify MCP configuration files. A patch or advisory has been published by the vendor.

disclosed CVENo confirmed exploitation, so this record is tracked as a disclosed vulnerability and not counted as an incident. It moves into the counts if CISA or the vendor confirms exploitation. Why

CVSS
6.5
EPSS
<0.01 · top 68% · 2026-11-13
EPSS scores by FIRST
fix status
Fix status unknown
first report
4 Sep 2026
last update
4 Sep 2026
CVE ids
CVE-2026-9186other records

Timeline · 1

  1. 4 Sep 2026CVE-2026-9186: IBM Langflow OSS 1.0.0 through 1.11.2 allows remote authenticated attackers to bypass localhost-only MCP configuration…

Sources · 1

Advisories and databases

  1. 2026-09-04
    CVE-2026-9186: IBM Langflow OSS 1.0.0 through 1.11.2 allows remote authenticated attackers to bypass localhost-only MCP configuration…
    NVD · nvd.nist.gov/vuln/detail/CVE-2026-9186

Titles and links belong to their publishers. The summary above is written by gcdRadar in its own words; data is CC BY-SA 4.0.

Classification

lane
Patch now
AI role
Attack on AI
categories
Infrastructure vulnerability
severity
2 · Disclosed vulnerability
fix status
Fix status unknown
targets
Framework / tooling
owasp llm top 10
LLM03:2025 Supply Chain
mitre atlas
no technique for these categories
tags
mcp
dates
happened 4 Sep 2026 · first reported 4 Sep 2026
origin
NVD
Vulnerability record from NVD / the GitHub Advisory Database. This product uses the NVD API but is not endorsed or certified by the NVD.
record
confidence 0.95 · created 2026-10-18 10:04Z · updated 2026-10-18 10:04Z

Lane, AI role, categories and severity come from the classifier; the OWASP and ATLAS rows are derived from the categories. How these are assigned

Copy a brief

This record as a short Markdown brief, for a ticket, a chat or a coding agent.

the brief as text
# CVE-2026-9186: IBM Langflow OSS localhost MCP configuration bypass

https://gcdradar.vercel.app/incidents/cve-2026-9186-ibm-langflow-oss-localhost-mcp-configuration-b · AIR-2026-1331 · closed 2026-09-04

- Lane: Patch now
- Severity: 2 (Disclosed vulnerability)
- Fix status: Fix status unknown
- First reported: 2026-09-04
- AI role: Attack on AI
- Products: Langflow
- CVE ids: CVE-2026-9186
- CVSS: 6.5

## Summary

An IP spoofing vulnerability in IBM Langflow OSS allows remote authenticated attackers to bypass localhost restrictions and modify MCP configuration files. A patch or advisory has been published by the vendor.

## What to do

No action recorded; read the sources below and the vendor's advisory.

## Latest updates

- 2026-09-04: CVE-2026-9186: IBM Langflow OSS 1.0.0 through 1.11.2 allows remote authenticated attackers to bypass localhost-only MCP configuration… (https://nvd.nist.gov/vuln/detail/CVE-2026-9186)

## Sources

- 2026-09-04 NVD: CVE-2026-9186: IBM Langflow OSS 1.0.0 through 1.11.2 allows remote authenticated attackers to bypass localhost-only MCP configuration… https://nvd.nist.gov/vuln/detail/CVE-2026-9186

Verify against the vendor's advisory before changing production. Data CC BY-SA 4.0, https://gcdradar.vercel.app.

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