gcdRadar
archive/Patch now/AIR-2026-0593
closedclosed 20 Apr 2026Patch now2 Disclosed vulnerabilityAI

CVE-2026-6599: Langflow MCP Configuration API Injection Vulnerability

Langflow

Langflow contained an injection vulnerability in its Model Context Protocol Configuration API via the X-Forwarded-For header. Public exploits were disclosed following vendor notification.

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
6.3
EPSS
<0.01 · top 86% · 2026-11-13
EPSS scores by FIRST
fix status
Fix status unknown
first report
20 Apr 2026
last update
20 Apr 2026
CVE ids
CVE-2026-6599other records

Timeline · 2

  1. 20 Apr 2026CVE-2026-6599: Langflow vulnerable to injection
  2. 20 Apr 2026CVE-2026-6599: A vulnerability was detected in langflow-ai langflow up to 1.8.3.

Sources · 2

Advisories and databases

  1. 2026-04-20
    CVE-2026-6599: Langflow vulnerable to injection
    GitHub Advisory Database · github.com/advisories/GHSA-v66p-f7x3-4794
  2. 2026-04-20
    CVE-2026-6599: A vulnerability was detected in langflow-ai langflow up to 1.8.3.
    NVD · nvd.nist.gov/vuln/detail/CVE-2026-6599

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
dates
happened 20 Apr 2026 · first reported 20 Apr 2026
origin
GitHub Advisory Database
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 07:00Z · 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-2026-6599: Langflow MCP Configuration API Injection Vulnerability

https://gcdradar.vercel.app/incidents/cve-2026-6599-langflow-mcp-configuration-api-injection-vulne · AIR-2026-0593 · closed 2026-04-20

- Lane: Patch now
- Severity: 2 (Disclosed vulnerability)
- Fix status: Fix status unknown
- First reported: 2026-04-20
- AI role: Attack on AI
- Products: Langflow
- CVE ids: CVE-2026-6599
- CVSS: 6.3

## Summary

Langflow contained an injection vulnerability in its Model Context Protocol Configuration API via the X-Forwarded-For header. Public exploits were disclosed following vendor notification.

## What to do

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

## Latest updates

- 2026-04-20: CVE-2026-6599: A vulnerability was detected in langflow-ai langflow up to 1.8.3. (https://nvd.nist.gov/vuln/detail/CVE-2026-6599)
- 2026-04-20: CVE-2026-6599: Langflow vulnerable to injection (https://github.com/advisories/GHSA-v66p-f7x3-4794)

## Sources

- 2026-04-20 GitHub Advisory Database: CVE-2026-6599: Langflow vulnerable to injection https://github.com/advisories/GHSA-v66p-f7x3-4794
- 2026-04-20 NVD: CVE-2026-6599: A vulnerability was detected in langflow-ai langflow up to 1.8.3. https://nvd.nist.gov/vuln/detail/CVE-2026-6599

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

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