A critical vulnerability has been discovered in Langflow, an open-source platform for building UIs for LangChain and other LLM frameworks. This flaw, identified as CVE-2025-3248, allows unauthenticated remote code execution.
The vulnerability stems from an insecure implementation that uses the Python exec function within a component designed to handle code evaluation. The exec function is inherently dangerous when used with untrusted input because it can execute arbitrary Python code. In this case, the way Langflow utilized it permitted attackers to inject malicious code without needing any form of authentication.
This means a remote attacker could potentially compromise systems running vulnerable versions of Langflow simply by sending specially crafted requests. The impact of remote code execution is severe, potentially leading to full system compromise, data theft, or disruption of services.
The vulnerability affects certain versions of Langflow prior to the fix. Users are strongly urged to update their Langflow installations immediately to the latest available version to remediate this critical security risk. Updating is the primary and most effective way to protect against exploitation of CVE-2025-3248. System administrators and developers using Langflow should prioritize this action to secure their applications and infrastructure.
Source: https://www.offsec.com/blog/cve-2025-3248/
