CVE-2025-6518: pyspur Incomplete Filtering of Special Elements allowed by SingleLLMCallNode function

June 23, 2025 (updated June 25, 2025)

A vulnerability was found in PySpur-Dev pyspur up to 0.1.18. It has been classified as critical. Affected is the function SingleLLMCallNode of the file backend/pyspur/nodes/llm/single_llm_call.py of the component Jinja2 Template Handler. The manipulation of the argument user_message leads to improper neutralization of special elements used in a template engine. It is possible to launch the attack remotely. The exploit has been disclosed to the public and may be used.

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Code Behaviors & Features

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