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CVE-2026-70470 is an incomplete blacklist-validation vulnerability in Flowise and flowise-components before 3.1.3. The validatePythonCodeForDataFrame routine attempts to block dangerous Python constructs before invoking Pyodide, including in CSVAgent and AirtableAgent execution paths. Its JavaScript regular expression uses ASCII-only word-boundary semantics, whereas Python 3 NFKC-normalizes identifiers when parsing. An attacker can therefore submit Unicode-homoglyph variants of blocked Python identifiers that evade validation but normalize to the prohibited identifiers at execution time. This enables arbitrary Python execution in Pyodide and can be escalated to host operating-system command execution through Pyodide JavaScript-module interoperation.
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Flowise vulnerability that could permit unintended operations on vulnerable platform components, potentially compromising application integrity and enabling follow-on malicious activity.
A critical remote code execution vulnerability in Flowise caused by a Unicode homoglyph bypass of the Python code validator, enabling arbitrary Python execution in Pyodide and OS command execution on the host.
A critical Flowise input-validation bypass caused by ASCII-only JavaScript word-boundary blacklist checks and Python NFKC identifier normalization. Unicode homoglyph identifiers bypass the blacklist, enabling arbitrary Python execution in Pyodide and OS command execution on the Flowise host.
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