Path Traversal Vulnerability in nanocoai NanoClaw by nanocoai
CVE-2026-18991

6.9MEDIUM

Key Information:

Vendor

Nanocoai

Status
Nanoclaw
Vendor
CVE Published:
6 August 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-18991?

A significant vulnerability has been identified in nanocoai's NanoClaw, affecting versions up to 2.0.64. This flaw resides specifically in the file container/agent-runner/src/mcp-tools/core.ts related to the send_file component. An attacker can exploit this vulnerability remotely, allowing unauthorized access to files that should be restricted. Despite early notification to the project regarding the issue, there has been no acknowledgment or resolution from the developers. This publicly disclosed vulnerability raises concerns for users of NanoClaw and highlights the need for immediate attention and patching.

Affected Version(s)

NanoClaw 2.0.0

NanoClaw 2.0.1

NanoClaw 2.0.2

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-2026-18991 - Proof of Concept

References

https://vuldb.com/vuln/386367
vdb-entry
https://vuldb.com/vuln/386367/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-18991
third-party-advisory

CVSS V4

Score:
6.9
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

JohnChen (VulDB User)
VulDB CNA Team
.