Unauthenticated RCE in IBM Langflow OSS PythonREPLComponent via builtins injection
CVE-2026-10561 is a critical unauthenticated remote code execution vulnerability affecting IBM Langflow OSS versions 1.0.0 through 1.9.3. The flaw is in the PythonREPLComponent ("Python Interpreter"), where get_globals() attempts to construct a restricted Python execution environment from a global_imports whitelist, but does not explicitly set globals_["builtins"] = {}. As a result, CPython's exec() automatically inserts the full builtins module into the globals dictionary when builtins is absent, defeating the intended restriction and making functions such as import, open, eval, and other builtins available. IBM states this execution-isolation failure can be combined with the default LANGFLOW_AUTO_LOGIN=true behavior, which issues a superuser JWT via GET /api/v1/auto_login without credentials, yielding unauthenticated access to the vulnerable functionality. Successful exploitation allows arbitrary code execution on the host system with the privileges of the Langflow backend process.
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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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