RCE in Jij-Inc Jij-Mcp-Server
CVE-2026-19964
A vulnerability was found in Jij-Inc Jij-MCP-Server 0.1.0. This affects the function PythonREPL.run of the file jij_mcp/python_repr.py of the component jm_check. The manipulation of the argument code results in code injection. It is possible to launch the attack remotely. The exploit has been made public and could be used. The project was informed of the problem early through an issue report but has not responded yet.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:L.
EPSS exploit prediction
EPSS: 0.003 (20.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 20th percentile — 20.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.003 · change: +0.001
Affected products
- Jij-Inc Jij-Mcp-Server — versions 0.1.0
Weakness classification (CWE)
References
- vuldb.com/vuln/391141 (technical-description, vdb-entry)
- vuldb.com/vuln/391141/cti (signature, permissions-required)
- vuldb.com/cve/CVE-2026-19964 (third-party-advisory)
- vuldb.com/submit/872906 (third-party-advisory)
- github.com/Jij-Inc/Jij-MCP-Server/issues/4 (issue-tracking, exploit)
Frequently asked questions
- What is CVE-2026-19964?
- CVE-2026-19964 is a medium-severity vulnerability in Jij-Inc Jij-Mcp-Server, classified under Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection). CVSS score: 5.5/10. Published 2026-08-17.
- How severe is CVE-2026-19964?
- Medium severity. CVSS v3 base score is 5.5 out of 10.