Vulnerability in Pyspur-Dev Pyspur
CVE-2025-6518
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L.
EPSS exploit prediction
EPSS: 0.004 (30.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 30th percentile — 30.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.004 · change: +0.000
Affected products
- Pyspur-Dev Pyspur — versions 0.1.0, 0.1.1, 0.1.2
Weakness classification (CWE)
References
- vuldb.com/ (technical-description, vdb-entry)
- vuldb.com/ (signature, permissions-required)
- vuldb.com/ (third-party-advisory)
- github.com/PySpur-Dev/pyspur/issues/289 (issue-tracking, exploit)
Frequently asked questions
- What is CVE-2025-6518?
- CVE-2025-6518 is a medium-severity vulnerability in Pyspur-Dev Pyspur, classified under CWE-791. CVSS score: 6.3/10. Published 2025-06-23.
- How severe is CVE-2025-6518?
- Medium severity. CVSS v3 base score is 6.3 out of 10.