CVE-2026-18991 Details
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.
A path traversal vulnerability has been identified in nanocoai NanoClaw versions through 2.0.64. The issue resides in the send_file component, specifically within the file container/agent-runner/src/mcp-tools/core.ts. This vulnerability allows for arbitrary file exfiltration by accepting absolute paths and copying the referenced files into an outbound directory, bypassing restrictions and exposing sensitive data from mounted directories.
Users can update to NanoClaw version 2.1.54 or later, where this vulnerability has been fixed.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Aug 6, 2026CISA-ADP
Assessed Aug 6, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/nanocoai/nanoclaw/ | [email protected] | Source CodeVendor |
| https://github.com/nanocoai/nanoclaw/issues/2760 | [email protected] | ExploitIssue TrackingTechnical DescriptionVendor |
| https://vuldb.com/cve/CVE-2026-18991 | [email protected] | AdvisoryPermission Required |
| https://vuldb.com/submit/862563 | [email protected] | Issue TrackingPermission Required |
| https://vuldb.com/vuln/386367 | [email protected] | BundlePermission Required |
| https://vuldb.com/vuln/386367/cti | [email protected] | Content Wall |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-22 | Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| nanocoai NanoClaw | <= 2.0.64 (semver) |
CPE
Remediation
| |
Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Aug 6, 2026 | CVE Modified | CISA-ADP |
| Aug 6, 2026 | New CVE Received | [email protected] |