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Vulnerability · Published Jun 23, 2025 · Assigned by VulDB

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

Medium 6.3

In plain English

A medium-severity security flaw in pyspur from PySpur-Dev. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 34% of all known vulnerabilities).

Severity (CVSS 3.1)6.3Medium
Exploit odds (30 days)0.4%top 65.8% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

Official 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 packages & fixed versions

EcosystemPackageFixed inAdvisory
PyPIpyspurno fix listedGHSA-8gff-cf92-72pv
PyPIpyspurno fix listedPYSEC-2026-1844

Affected products (as reported)

VendorProductVersions
PySpur-Dev pyspur 0.1.00.1.10.1.20.1.30.1.40.1.50.1.60.1.7

Weakness: CWE-1336, CWE-791 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:R

References