CVE-2025-6518: Pyspur-Dev Pyspur

Medium severity, CVSS 6.3. EPSS: 0.4% chance of exploitation in the next 30 days.

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.

Affected products

• Pyspur-Dev Pyspur: version 0.1.0 only; version 0.1.1 only; version 0.1.2 only; version 0.1.3 only; version 0.1.4 only; version 0.1.5 only; …

Published 2025-06-23. Last modified 2026-06-17.