PySpur-Dev pyspur up to 0.1.18 Jinja2 Template single_llm_call.py SingleLLMCallNode user_message special elements used in a template engine

Summaryinfo

A vulnerability labeled as critical has been found in PySpur-Dev pyspur up to 0.1.18. The affected element 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 results in improper neutralization of special elements used in a template engine. This vulnerability was named CVE-2025-6518. The attack may be performed from remote. In addition, an exploit is available.

Detailsinfo

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 with an unknown input leads to a improper neutralization of special elements used in a template engine vulnerability. CWE is classifying the issue as CWE-1336. The product uses a template engine to insert or process externally-influenced input, but it does not neutralize or incorrectly neutralizes special elements or syntax that can be interpreted as template expressions or other code directives when processed by the engine. This is going to have an impact on confidentiality, integrity, and availability.

The advisory is available at github.com. This vulnerability is traded as CVE-2025-6518. The exploitability is told to be easy. It is possible to launch the attack remotely. Technical details and a public exploit are known. This vulnerability is assigned to T1221 by the MITRE ATT&CK project.

The exploit is shared for download at github.com. It is declared as proof-of-concept.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Vendor

• PySpur-Dev

Name

• pyspur

Version

• 0.1.0
• 0.1.1
• 0.1.2
• 0.1.3
• 0.1.4
• 0.1.5
• 0.1.6
• 0.1.7
• 0.1.8
• 0.1.9
• 0.1.10
• 0.1.11
• 0.1.12
• 0.1.13
• 0.1.14
• 0.1.15
• 0.1.16
• 0.1.17
• 0.1.18

Website

• Product: https://github.com/PySpur-Dev/pyspur/

CPE 2.3info

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CPE 2.2info

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Exploitinginfo

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Entryinfo

Submitinfo

Accepted

• Submit #593612: PySpur-Dev pyspur <=v0.1.18 Remote Code Execute (by github.com)

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