TI-2025-05918 Aliases CVE-2025-6518 GHSA-8gff-cf92-72pv

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

MEDIUM 57CWE-1336Published 2025-06-23 · Updated 2025-06-23

Key facts

Attack vector: Network
Privileges required: Low
User interaction: None
Attack complexity: Low
Attack requirements: None
Impact type: Code execution
Confidentiality · integrity · availability: Low · Low · Low
Fix status: No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-1336.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00398 34th percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by the CNA

Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
PySpur-Dev	pyspur	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	—	No fix listed	CNA
—	pyspur (PyPI)	up to 0.1.18	—	No fix listed	GHSA-8gff-cf92-72pv

pyspur VendorPySpur-Dev Affected 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 Fixed in — No fix listed CNA
pyspur (PyPI) Vendor— Affected up to 0.1.18 Fixed in — No fix listed GHSA-8gff-cf92-72pv

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2025-6518
2026-10-03 Alias added: GHSA-8gff-cf92-72pv

References

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences