CVE-2026-3340 Server-Side Request Forgery (SSRF) in Langflow URL Component

What is CVE-2026-3340?

CVE-2026-3340 is a medium-severity server-side request forgery vulnerability in IBM Langflow Desktop, published on 30 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

IBM Langflow Desktop 1.0.0 through 1.8.4 IBM Langflow is vulnerable to server-side request forgery (SSRF). This may allow an authenticated attacker to send unauthorized requests from the system, potentially leading to network enumeration or facilitating other attacks.

Weakness: CWE-918

Which versions are affected by CVE-2026-3340?

It affects 1 product.

Products include Langflow Langflow Desktop.

How do I fix CVE-2026-3340?

No fix has been published for CVE-2026-3340 yet. Limit exposure of the affected software until one is available.

Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.

Is CVE-2026-3340 being exploited?

There is no known exploitation of CVE-2026-3340 in the wild and no public exploit code.

Other vulnerabilities in IBM Langflow Desktop

• CVE-2026-6543 Authenticated Remote Code Execution Vulnerability in Langflow Code Validation Endpoint High 8.8
• CVE-2026-4503 Unauthenticated Insecure Direct Object Reference (IDOR) Vulnerability in Langflow Desktop Image Download Endpoint High 7.5
• 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-6c85-4v28-rfx8.