bitbonsai MCPVault up to 0.11.4 PathFilter src/pathfilter.ts isAllowed/isAllowedForListing path traversal

Summaryinfo

A vulnerability classified as critical has been found in bitbonsai MCPVault up to 0.11.4. Impacted is the function isAllowed/isAllowedForListing of the file src/pathfilter.ts of the component PathFilter. This manipulation causes path traversal. This vulnerability is handled as CVE-2026-57442. The attack can be initiated remotely. There is not any exploit available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability was found in bitbonsai MCPVault up to 0.11.4. It has been declared as critical. Affected by this vulnerability is the function isAllowed/isAllowedForListing of the file src/pathfilter.ts of the component PathFilter. The manipulation with an unknown input leads to a path traversal vulnerability. The CWE definition for the vulnerability is 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. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

MCPVault is a lightweight Model Context Protocol server for safe access to files in an Obsidian vault. Prior to 0.11.5, PathFilter in src/pathfilter.ts uses root-anchored deny-list patterns, so nested .git, .obsidian, and node_modules path segments do not match the restriction and pass both isAllowed() and isAllowedForListing(). An attacker who influences a path selected by an AI agent can traverse nested repository or Obsidian metadata, read remote URLs or embedded tokens, or cause nested node_modules content to pollute the listAllTags index. This issue is fixed in version 0.11.5.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-57442 since 06/24/2026. The exploitation appears to be easy. The attack can be launched remotely. It demands that the victim is doing some kind of user interaction. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1006 according to MITRE ATT&CK.

Upgrading to version 0.11.5 eliminates this vulnerability.

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Productinfo

Vendor

• bitbonsai

Name

• MCPVault

Version

• 0.11.0
• 0.11.1
• 0.11.2
• 0.11.3
• 0.11.4

Website

• Product: https://github.com/bitbonsai/mcpvault/

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