CVE-2026-17434 - Vulnerability Details

- nanocoai NanoClaw add_mcp_server request.ts handleAddMcpServer improper authorization

Description

A flaw has been found in nanocoai NanoClaw up to 2.0.64. Affected is the function handleAddMcpServer of the file src/modules/self-mod/request.ts of the component add_mcp_server. Executing a manipulation can lead to improper authorization. The attack may be launched remotely. The exploit has been published and may be used. This patch is called e5b928783d5c485637565eb07d2967922dfbf8d8. A patch should be applied to remediate this issue.

Published: 2026-07-26

Score: 5.3 Medium

EPSS: < 1% Very Low

KEV: No

Impact:

Action:

Analysis

Impact

A flaw in the handleAddMcpServer function of the NanoClaw add_mcp_server module allows attackers to bypass normal authorization controls, enabling them to add or modify MCP server configurations. This improper authorization issue corresponds to CWE-266 and CWE-285 and may lead to unauthorized network access or data exposure.

Affected Systems

The vulnerability impacts nanocoai NanoClaw versions up to and including 2.0.64. Any installation of NanoClaw from the vendor prior to the patched release is vulnerable.

Risk and Exploitability

The CVSS score of 5.3 indicates a moderate severity and the EPSS score of less than 1% suggests a low probability of exploitation in the wild, although an exploit has already been published and can be launched remotely. The issue is not listed in the CISA KEV catalog, but the remote nature of the attack and the availability of exploitation code warrant prompt action to prevent unauthorized server configuration changes.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

nanocoai

NanoClaw

affected

Version	Status	Constraints
`2.0.0`	affected	—
`2.0.1`	affected	—
`2.0.2`	affected	—
`2.0.3`	affected	—
`2.0.4`	affected	—
`2.0.5`	affected	—
`2.0.6`	affected	—
`2.0.7`	affected	—
`2.0.8`	affected	—
`2.0.9`	affected	—
`2.0.10`	affected	—
`2.0.11`	affected	—
`2.0.12`	affected	—
`2.0.13`	affected	—
`2.0.14`	affected	—
`2.0.15`	affected	—
`2.0.16`	affected	—
`2.0.17`	affected	—
`2.0.18`	affected	—
`2.0.19`	affected	—
`2.0.20`	affected	—
`2.0.21`	affected	—
`2.0.22`	affected	—
`2.0.23`	affected	—
`2.0.24`	affected	—
`2.0.25`	affected	—
`2.0.26`	affected	—
`2.0.27`	affected	—
`2.0.28`	affected	—
`2.0.29`	affected	—
`2.0.30`	affected	—
`2.0.31`	affected	—
`2.0.32`	affected	—
`2.0.33`	affected	—
`2.0.34`	affected	—
`2.0.35`	affected	—
`2.0.36`	affected	—
`2.0.37`	affected	—
`2.0.38`	affected	—
`2.0.39`	affected	—
`2.0.40`	affected	—
`2.0.41`	affected	—
`2.0.42`	affected	—
`2.0.43`	affected	—
`2.0.44`	affected	—
`2.0.45`	affected	—
`2.0.46`	affected	—
`2.0.47`	affected	—
`2.0.48`	affected	—
`2.0.49`	affected	—
`2.0.50`	affected	—
`2.0.51`	affected	—
`2.0.52`	affected	—
`2.0.53`	affected	—
`2.0.54`	affected	—
`2.0.55`	affected	—
`2.0.56`	affected	—
`2.0.57`	affected	—
`2.0.58`	affected	—
`2.0.59`	affected	—
`2.0.60`	affected	—
`2.0.61`	affected	—
`2.0.62`	affected	—
`2.0.63`	affected	—
`2.0.64`	affected	—

No data.

Vendor Product Confidence Versions

Nanocoai

Nanoclaw

95%

Version	Status	Scheme	Platform
`2.0.0`	affected	semver	—
`2.0.1`	affected	semver	—
`2.0.2`	affected	semver	—
`2.0.3`	affected	semver	—
`2.0.4`	affected	semver	—
`2.0.5`	affected	semver	—
`2.0.6`	affected	semver	—
`2.0.7`	affected	semver	—
`2.0.8`	affected	semver	—
`2.0.9`	affected	semver	—
`2.0.10`	affected	semver	—
`2.0.11`	affected	semver	—
`2.0.12`	affected	semver	—
`2.0.13`	affected	semver	—
`2.0.14`	affected	semver	—
`2.0.15`	affected	semver	—
`2.0.16`	affected	semver	—
`2.0.17`	affected	semver	—
`2.0.18`	affected	semver	—
`2.0.19`	affected	semver	—
`2.0.20`	affected	semver	—
`2.0.21`	affected	semver	—
`2.0.22`	affected	semver	—
`2.0.23`	affected	semver	—
`2.0.24`	affected	semver	—
`2.0.25`	affected	semver	—
`2.0.26`	affected	semver	—
`2.0.27`	affected	semver	—
`2.0.28`	affected	semver	—
`2.0.29`	affected	semver	—
`2.0.30`	affected	semver	—
`2.0.31`	affected	semver	—
`2.0.32`	affected	semver	—
`2.0.33`	affected	semver	—
`2.0.34`	affected	semver	—
`2.0.35`	affected	semver	—
`2.0.36`	affected	semver	—
`2.0.37`	affected	semver	—
`2.0.38`	affected	semver	—
`2.0.39`	affected	semver	—
`2.0.40`	affected	semver	—
`2.0.41`	affected	semver	—
`2.0.42`	affected	semver	—
`2.0.43`	affected	semver	—
`2.0.44`	affected	semver	—
`2.0.45`	affected	semver	—
`2.0.46`	affected	semver	—
`2.0.47`	affected	semver	—
`2.0.48`	affected	semver	—
`2.0.49`	affected	semver	—
`2.0.50`	affected	semver	—
`2.0.51`	affected	semver	—
`2.0.52`	affected	semver	—
`2.0.53`	affected	semver	—
`2.0.54`	affected	semver	—
`2.0.55`	affected	semver	—
`2.0.56`	affected	semver	—
`2.0.57`	affected	semver	—
`2.0.58`	affected	semver	—
`2.0.59`	affected	semver	—
`2.0.60`	affected	semver	—
`2.0.61`	affected	semver	—
`2.0.62`	affected	semver	—
`2.0.63`	affected	semver	—
`2.0.64`	affected	semver	—

Found an issue or want to improve our Enrichment? You can suggest it directly by opening an issue on our dedicated GitHub repository .

Remediation

No vendor fix or workaround currently provided.

OpenCVE Recommended Actions

Install the patch commit e5b928783d5c485637565eb07d2967922dfbf8d8 to upgrade NanoClaw to version 2.0.65 or later.
Restrict access to the add_mcp_server API endpoint to authorized administrative users only.
Monitor system logs for unexpected add_mcp_server activity and verify that only legitimate users are performing these actions.

Generated by OpenCVE AI on August 3, 2026 at 18:17 UTC.

Tracking

Sign in to view the affected projects.

Advisories

No advisories yet.

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact Low

Vulnerable System Integrity Impact Low

Vulnerable System Availability Impact Low

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact Low

Integrity Impact Low

Availability Impact Low

User Interaction None

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact Low

Integrity Impact Low

Availability Impact Low

User Interaction None

Access Vector Network

Access Complexity Low

Authentication Single

Confidentiality Impact Partial

Integrity Impact Partial

Availability Impact Partial

This CVE is not in the KEV list.

The EPSS score is 0.00214.

Exploitation poc

Automatable no

Technical Impact partial

References

Link	Providers
https://github.com/nanocoai/nanoclaw/
https://github.com/nanocoai/nanoclaw/commit/e5b928783d5c485637565eb07d2967922dfbf8d8
https://github.com/nanocoai/nanoclaw/issues/2762
https://github.com/nanocoai/nanoclaw/pull/2998
https://vuldb.com/cve/CVE-2026-17434
https://vuldb.com/submit/862451
https://vuldb.com/vuln/383075
https://vuldb.com/vuln/383075/cti

History

Mon, 27 Jul 2026 15:30:00 +0000

Type	Values Removed	Values Added
Metrics		ssvc `{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}`

Sun, 26 Jul 2026 04:00:00 +0000

Type	Values Removed	Values Added
Description		A flaw has been found in nanocoai NanoClaw up to 2.0.64. Affected is the function handleAddMcpServer of the file src/modules/self-mod/request.ts of the component add_mcp_server. Executing a manipulation can lead to improper authorization. The attack may be launched remotely. The exploit has been published and may be used. This patch is called e5b928783d5c485637565eb07d2967922dfbf8d8. A patch should be applied to remediate this issue.
Title		nanocoai NanoClaw add_mcp_server request.ts handleAddMcpServer improper authorization
First Time appeared		Nanocoai Nanocoai nanoclaw
Weaknesses		CWE-266 CWE-285
CPEs		cpe:2.3:a:nanocoai:nanoclaw::::::::
Vendors & Products		Nanocoai Nanocoai nanoclaw
References		https://github.com/nanocoai/nanoclaw/ https://github.com/nanocoai/nanoclaw/commit/e5b928783d5c485637565eb07d2967922dfbf8d8 https://github.com/nanocoai/nanoclaw/issues/2762 https://github.com/nanocoai/nanoclaw/pull/2998 https://vuldb.com/cve/CVE-2026-17434 https://vuldb.com/submit/862451 https://vuldb.com/vuln/383075 https://vuldb.com/vuln/383075/cti
Metrics		cvssV2_0 `{'score': 6.5, 'vector': 'AV:N/AC:L/Au:S/C:P/I:P/A:P/E:POC/RL:OF/RC:C'}` cvssV3_0 `{'score': 6.3, 'vector': 'CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C'}` cvssV3_1 `{'score': 6.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C'}` cvssV4_0 `{'score': 5.3, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P'}`

Subscriptions

Nanocoai Nanoclaw

MITRE

Status: PUBLISHED

Assigner: VulDB

Published: 2026-07-26T03:00:16.981Z

Updated: 2026-07-27T14:37:23.201Z

Reserved: 2026-07-25T11:08:25.395Z

Link: CVE-2026-17434

Vulnrichment

Updated: 2026-07-27T14:37:19.965Z

NVD

Status : Deferred

Published: 2026-07-26T04:16:46.573

Modified: 2026-07-27T20:25:13.817

Link: CVE-2026-17434

Redhat

No data.

OpenCVE Enrichment

Updated: 2026-08-03T18:30:06Z

Weaknesses

CWE-266
Incorrect Privilege Assignment
CWE-285
Improper Authorization

Impact

Affected Systems

Risk and Exploitability

Tracking

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact Low

Vulnerable System Integrity Impact Low

Vulnerable System Availability Impact Low

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact Low

Integrity Impact Low

Availability Impact Low

User Interaction None

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact Low

Integrity Impact Low

Availability Impact Low

User Interaction None

Access Vector Network

Access Complexity Low

Authentication Single

Confidentiality Impact Partial

Integrity Impact Partial

Availability Impact Partial

Exploitation poc

Automatable no

Technical Impact partial

Subscriptions

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