Unauthenticated RCE in Langflow OSS PythonREPLComponent via Builtins Injection
CVE-2026-10561 is a critical unauthenticated remote code execution vulnerability in IBM Langflow OSS versions 1.0.0 through 1.9.3. The flaw is in the PythonREPLComponent ("Python Interpreter"), where the get_globals() logic attempts to restrict Python execution using a global_imports whitelist, but does not explicitly set globals_["builtins"] = {}. As a result, CPython exec() automatically inserts the full builtins module when builtins is absent from the globals dictionary, defeating the intended isolation and making functions such as import, open, eval, and other builtins available to attacker-controlled code. IBM states this execution-isolation flaw can be combined with the default LANGFLOW_AUTO_LOGIN=true behavior, which issues a superuser JWT via GET /api/v1/auto_login without credentials, producing an unauthenticated path to arbitrary code execution on the host system.
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Recent activity
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A critical unauthenticated remote code execution vulnerability in IBM Langflow OSS caused by improper isolation of Python execution combined with an authentication bypass, allowing arbitrary code execution and full host compromise.
An unauthenticated remote code execution vulnerability in Langflow OSS caused by improper isolation of Python execution in PythonREPLComponent combined with an authentication bypass, allowing arbitrary code execution and complete host compromise.
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