CVE-2026-19244

MEDIUM

HKUDS nanobot MCP enabledTools Scope mcp.py connect_mcp_servers access control

Title source: cna
STIX 2.1

Description

A vulnerability was detected in HKUDS nanobot up to 0.2.1. The affected element is the function connect_mcp_servers of the file nanobot/agent/tools/mcp.py of the component MCP enabledTools Scope Handler. Performing a manipulation results in improper access controls. The attack is possible to be carried out remotely. The exploit is now public and may be used. Upgrading to version 0.3.0 is sufficient to fix this issue. The patch is named 4436. You should upgrade the affected component. Multiple issues were reported to the project. They reacted with a high level of professionalism and kindness: "Both reports describe the same root cause: MCP resource and prompt wrappers could be registered outside the intended enabledTools scope. The registration boundary was corrected".

References (10)

Core 10
Core References
Vdb Entry, Technical Description vdb-entry technical-description
VDB-386998 | HKUDS nanobot MCP enabledTools Scope mcp.py connect_mcp_servers access control
https://vuldb.com/vuln/386998
Signature, Permissions Required signature permissions-required
VDB-386998 | CTI Indicators (IOB, IOC, TTP, IOA)
https://vuldb.com/vuln/386998/cti
Third Party Advisory third-party-advisory
CVE-2026-19244 | CVE Analysis and Report
https://vuldb.com/cve/CVE-2026-19244
Third Party Advisory third-party-advisory
Submit #865116 | HKUDS nanobot 0.2.1 Improper Access Control in MCP Capability Registration (CWE-284)
https://vuldb.com/submit/865116
Third Party Advisory third-party-advisory
Submit #865118 | HKUDS nanobot 0.2.1 Improper Access Control in MCP Wrapper Exposure (CWE-284) (Duplicate)
https://vuldb.com/submit/865118
Issue Tracking issue-tracking
https://github.com/HKUDS/nanobot/issues/4435
Patch issue-tracking patch
https://github.com/HKUDS/nanobot/pull/4436

Scores

CVSS v3 4.7
EPSS 0.0027
EPSS Percentile 19.3%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:L

CISA SSVC

Vulnrichment
Exploitation poc
Automatable no
Technical Impact partial

Details

CWE
CWE-266 CWE-284
Status published
Products (3)
HKUDS/nanobot 0.2.0
HKUDS/nanobot 0.2.1
HKUDS/nanobot 0.3.0
Published Aug 07, 2026
Tracked Since Aug 08, 2026