CVE-2026-13435 Python Interpreter Sandbox Bypass Leading to Sensitive Data Exposure

What is CVE-2026-13435?

CVE-2026-13435 is a critical code injection vulnerability in Langflow Langflow, published on 30 Jul 2026. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

IBM Langflow OSS 1.0.0 through 1.10.1 contains an improper input validation vulnerability in the PythonREPL sandbox implementation.

Weakness: CWE-94

Which versions are affected by CVE-2026-13435?

It affects 1 product.

Products include Langflow Langflow.

How do I fix CVE-2026-13435?

No fix has been published for CVE-2026-13435 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-2026-13435 being exploited?

There is no known exploitation of CVE-2026-13435 in the wild and no public exploit code.

Other vulnerabilities in Langflow Langflow

• CVE-2026-9198 IBM Langflow Code Injection Exploited Critical 9.8
• CVE-2026-0770 Langflow Inclusion of Functionality from Untrusted Control Sphere Exploited Critical 9.8
• CVE-2025-3248 Langflow Missing Authentication Exploited Critical 9.8
• CVE-2025-34291 Langflow Origin Validation Error Exploited Critical 9.4
• CVE-2026-33017 Langflow Code Injection Exploited Critical 9.3

All Langflow Langflow vulnerabilities

Sources

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

Also known as GHSA-h7x8-fr4c-w46c.