Advisory Details

This vulnerability allows remote attackers to execute arbitrary code on affected installations of Langflow. Authentication is not required to exploit this vulnerability.

The specific flaw exists within the implementation of eval_custom_component_code function. The issue results from the lack of proper validation of a user-supplied string before using it to execute python code. An attacker can leverage this vulnerability to execute code in the context of the current process.

07/18/25 – ZDI submitted the report to the vendor’s GitHub account
09/11/25 – ZDI asked for updates
10/10/25 – ZDI asked for the fix
12/10/25 – ZDI notified the vendor of the intention to publish the case as a 0-day advisory

-- Mitigation: Given the nature of the vulnerability, the only salient mitigation strategy is to restrict interaction with the product

• 2025-07-18 - Vulnerability reported to vendor
• 2026-01-09 - Coordinated public release of advisory
• 2026-01-09 - Advisory Updated