CVE-2026-6543 Authenticated Remote Code Execution Vulnerability in Langflow Code Validation Endpoint

What is CVE-2026-6543?

CVE-2026-6543 is a high-severity code injection vulnerability in IBM Langflow Desktop, published on 30 Apr 2026. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

IBM Langflow Desktop 1.0.0 through 1.8.4 Langflow allows an attacker to execute arbitrary commands with the privileges of the process running Langflow. This allows reading sensitive environment variables (API keys, DB credentials), modifying files, or launching further attacks on the internal network.

Weakness: CWE-94

Which versions are affected by CVE-2026-6543?

It affects 1 product.

Products include Langflow Langflow Desktop.

How do I fix CVE-2026-6543?

No fix has been published for CVE-2026-6543 yet. Limit exposure of the affected software until one is available.

Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.

Is CVE-2026-6543 being exploited?

There is no known exploitation of CVE-2026-6543 in the wild and no public exploit code.

Other vulnerabilities in IBM Langflow Desktop

• CVE-2026-4503 Unauthenticated Insecure Direct Object Reference (IDOR) Vulnerability in Langflow Desktop Image Download Endpoint High 7.5
• CVE-2026-3340 Server-Side Request Forgery (SSRF) in Langflow URL Component Medium 6.5
• CVE-2026-3345 Path Traversal and Arbitrary File Write Vulnerability in IBM Langflow Desktop API v2 File Upload Endpoint Medium 6.5
• CVE-2026-4502 Arbitrary File Write and Remote Code Execution Vulnerability in Langflow v2 API Medium 6.5
• CVE-2026-3346 Stored Cross-Site Scripting (XSS) in Langflow Markdown Rendering via rehypeRaw Medium 6.4

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-3qgh-3gr3-38fg.