Code Injection Vulnerability in Jij-Inc Jij-MCP-Server
CVE-2026-19964

5.1MEDIUM

Key Information:

Vendor

Jij-inc

Status
Jij-mcp-server
Vendor
CVE Published:
16 August 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-19964?

A code injection vulnerability exists in the Jij-Inc Jij-MCP-Server 0.1.0, specifically in the PythonREPL.run function within the file jij_mcp/python_repr.py. This issue allows for remote code execution due to improper handling of input arguments, enabling attackers to manipulate the 'code' argument to execute arbitrary code. Although the project has acknowledged this vulnerability through an issue report, they have yet to provide an official response or patch, exposing users to potential remote attacks.

Affected Version(s)

Jij-MCP-Server 0.1.0

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-19964 - Proof of Concept

References

https://vuldb.com/vuln/391141
vdb-entrytechnical-description
https://vuldb.com/vuln/391141/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-19964
third-party-advisory

CVSS V4

Score:
5.1
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

TianyuLi (VulDB User)
VulDB CNA Team
.