What’s Vulnerable › Vulnerabilities

CVE-2025-6518: PySpur-Dev pyspur Jinja2 Template single_llm_call.py SingleLLMCallNode special elements used in a template engine

• Severity: medium (CVSS 6.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-06-23 · updated 2026-06-17
• Weakness: CWE-791

Description

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: 0.1.0, 0.1.1, 0.1.2, 0.1.3, 0.1.4, 0.1.5 (+13)

References

• https://github.com/PySpur-Dev/pyspur/issues/289
• https://vuldb.com/?ctiid.313638
• https://vuldb.com/?id.313638
• https://vuldb.com/?submit.593612

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