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.

References

• https://nvd.nist.gov/vuln/detail/CVE-2025-6518
• PySpur-Dev/pyspur#289
• https://vuldb.com/?ctiid.313638
• https://vuldb.com/?id.313638
• https://vuldb.com/?submit.593612