CVE-2026-18991
Received Received - Intake

Path Traversal in NanoClaw File Handler

Publication date: 2026-08-06

Last updated on: 2026-08-06

Assigner: VulDB

Description
A security vulnerability has been detected in nanocoai NanoClaw up to 2.0.64. This affects an unknown part of the file container/agent-runner/src/mcp-tools/core.ts of the component send_file. Such manipulation leads to path traversal. The attack can be executed remotely. The exploit has been disclosed publicly and may be used. The project was informed of the problem early through an issue report but has not responded yet.

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Meta Information

Published
2026-08-06
Last Modified
2026-08-06
Generated
2026-08-06
AI Q&A
2026-08-06
EPSS Evaluated
N/A
NVD
CVE-2026-18991
EUVD
EUVD-2026-53701

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
nanocoai nanoclaw to 2.0.64 (inc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-22 The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.

Attack-Flow Graph

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Executive Summary

This vulnerability is a path traversal flaw in NanoClaw up to version 2.0.64. It exists in the send_file MCP tool where improper handling of absolute filesystem paths allows arbitrary local file exfiltration. The tool copies files without canonicalization or containment checks, exposing sensitive data through NanoClaw's attachment system.

Detection Guidance

Check NanoClaw logs for suspicious file access patterns, particularly in the container/agent-runner/src/mcp-tools/core.ts component. Look for requests involving absolute paths or files outside expected directories like /workspace/extra. Monitor outbound attachments for unexpected data exfiltration.

Impact Analysis

An attacker could remotely exploit this to read and exfiltrate any readable file in the container namespace, including those under /workspace/extra/*. This could lead to unauthorized access to sensitive data such as credentials, configuration files, or other confidential information processed by NanoClaw.

Compliance Impact

This vulnerability could lead to unauthorized data exfiltration, violating GDPR's data protection principles and HIPAA's security requirements for protected health information. Organizations using affected NanoClaw versions may face compliance breaches, legal penalties, and reputational damage due to potential exposure of sensitive data.

Mitigation Strategies
  • Upgrade NanoClaw to a version beyond 2.0.64 if available.
  • Restrict file access in NanoClaw containers to specific trusted directories only.
  • Implement path canonicalization in the send_file MCP tool to prevent absolute path traversal.
  • Disable the send_file MCP tool if not required for operations.

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