debugmcp mcp-debugger up to 0.20.0 src/server.ts handleGetSourceContext path traversal

Summaryinfo

A vulnerability was found in debugmcp mcp-debugger up to 0.20.0. It has been declared as critical. The affected element is the function handleGetSourceContext of the file src/server.ts. The manipulation results in path traversal. This vulnerability was named CVE-2026-9467. The attack may be performed from remote. In addition, an exploit is available. The vendor was contacted early about this disclosure but did not respond in any way.

Detailsinfo

A vulnerability, which was classified as problematic, was found in debugmcp mcp-debugger up to 0.20.0. Affected is the function handleGetSourceContext of the file src/server.ts. The manipulation with an unknown input leads to a path traversal vulnerability. CWE is classifying the issue as 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. This is going to have an impact on confidentiality.

The advisory is shared for download at github.com. This vulnerability is traded as CVE-2026-9467. The exploitability is told to be easy. It is possible to launch the attack remotely. Technical details and a public exploit are known. The MITRE ATT&CK project declares the attack technique as T1006.

The exploit is shared for download at github.com. It is declared as proof-of-concept. The vendor was contacted early about this disclosure but did not respond in any way.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-31697). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Type

• Artificial Intelligence Software

Vendor

• debugmcp

Name

• mcp-debugger

Version

• 0.1
• 0.2
• 0.3
• 0.4
• 0.5
• 0.6
• 0.7
• 0.8
• 0.9
• 0.10
• 0.11
• 0.12
• 0.13
• 0.14
• 0.15
• 0.16
• 0.17
• 0.18
• 0.19
• 0.20.0

CPE 2.3info

• 🔒
• 🔒
• 🔒

CPE 2.2info

• 🔒
• 🔒
• 🔒

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CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

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Timelineinfo

Sourcesinfo

Entryinfo

Submitinfo

Accepted

• Submit #813980: debugmcp mcp-debugger 3e83906c8358965efd683c734e94a75d338400fa Path Traversal (by github.com)

VulDB is the best source for vulnerability data and more expert information about this specific topic.

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