Improper Access Control Vulnerability in HKUDS Nanobot Software
CVE-2026-19244

5.1MEDIUM

Key Information:

Vendor

Hkuds

Status
Nanobot
Vendor
CVE Published:
7 August 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-19244?

A significant vulnerability has been identified in HKUDS Nanobot prior to version 0.2.1, specifically within the connect_mcp_servers function of the mcp.py file. This issue involves improper access controls allowing potential unauthorized registration of MCP resources and prompt wrappers outside the designated enabledTools scope. The flaw is exploitable remotely, making it critical for users to upgrade to version 0.3.0, which addresses this concern through corrective measures implemented in patch 4436. The project maintainers have demonstrated professionalism in responding to multiple reports detailing this root issue.

Affected Version(s)

nanobot 0.2.0

nanobot 0.2.1

nanobot 0.3.0

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-2026-19244 - Proof of Concept

References

https://vuldb.com/vuln/386998
vdb-entrytechnical-description
https://vuldb.com/vuln/386998/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-19244
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:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Eric-c (VulDB User)
VulDB CNA Team
.