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.

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.

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.

Affected products

Jij-inc Jij-mcp-server — versions 0.1.0

Weakness classification (CWE)

References

cna@vuldb.com (technical-description, vdb-entry)
cna@vuldb.com (signature, permissions-required)
cna@vuldb.com (third-party-advisory)
cna@vuldb.com (third-party-advisory)
cna@vuldb.com (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.