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CVE-2026-33873 is an authenticated code execution vulnerability in Langflow affecting versions prior to 1.9.0. The flaw resides in the Agentic Assistant feature, where LLM-generated Python code is executed during the validation phase. Instead of performing strictly static validation, the implementation reaches dynamic execution sinks and instantiates the generated class on the server. In deployments where an attacker can access the Agentic Assistant feature and influence model output, this behavior can be abused to execute arbitrary Python code server-side.
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No public exploit code observed for this vulnerability.
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A related authenticated code execution vulnerability affecting Langflow's Agentic Assistant validation pipeline.
An arbitrary server-side Python code execution vulnerability in Langflow's Agentic Assistant feature caused by execution of LLM-generated Python code during validation prior to version 1.9.0.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.