CVE-2026-57441: CWE-41: Improper Resolution of Path Equivalence in bitbonsai mcpvault
MCPVault is a lightweight Model Context Protocol server for safe access to files in an Obsidian vault. Prior to 0.11.4, PathFilter in src/pathfilter.ts compiles restricted-directory patterns case-sensitively and compares paths without canonicalizing filesystem-equivalent segment names. On case-insensitive macOS and Windows filesystems, case variants of .git, .obsidian, or node_modules pass both isAllowed() and isAllowedForListing() even though the operating system opens the restricted directory, and Windows trailing dots or spaces provide the same bypass. An attacker who influences a path selected by an AI agent can use the bypass in read, write, move, search, or listing operations to expose or modify sensitive repository and Obsidian metadata. Vault-root .. containment is not affected. This issue is fixed in version 0.11.4.
AI Analysis
Technical Summary
MCPVault versions before 0.11.4 contain a path filtering vulnerability where restricted-directory patterns are compiled case-sensitively and paths are compared without canonicalizing equivalent filesystem segments. On case-insensitive filesystems such as macOS and Windows, attackers can use case variants or Windows-specific trailing dots/spaces to bypass checks in isAllowed() and isAllowedForListing(), gaining unauthorized read, write, move, search, or listing access to sensitive directories like .git, .obsidian, or node_modules. The vault-root containment via '..' is not affected. This vulnerability is resolved in version 0.11.4.
Potential Impact
An attacker able to influence paths selected by an AI agent can bypass directory restrictions on case-insensitive filesystems, potentially exposing or modifying sensitive repository and Obsidian metadata. This affects read, write, move, search, and listing operations. The vulnerability does not allow vault-root directory traversal via '..'. The CVSS 4.0 score is 8.4 (high severity), indicating significant impact with low attack complexity and no privileges required but user interaction needed.
Mitigation Recommendations
Upgrade mcpvault to version 0.11.4 or later, where this path equivalence resolution issue is fixed. No other mitigations are indicated by the vendor advisory. Patch status is confirmed fixed in 0.11.4.
CVE-2026-57441: CWE-41: Improper Resolution of Path Equivalence in bitbonsai mcpvault
Description
MCPVault is a lightweight Model Context Protocol server for safe access to files in an Obsidian vault. Prior to 0.11.4, PathFilter in src/pathfilter.ts compiles restricted-directory patterns case-sensitively and compares paths without canonicalizing filesystem-equivalent segment names. On case-insensitive macOS and Windows filesystems, case variants of .git, .obsidian, or node_modules pass both isAllowed() and isAllowedForListing() even though the operating system opens the restricted directory, and Windows trailing dots or spaces provide the same bypass. An attacker who influences a path selected by an AI agent can use the bypass in read, write, move, search, or listing operations to expose or modify sensitive repository and Obsidian metadata. Vault-root .. containment is not affected. This issue is fixed in version 0.11.4.
CVSS v4.0
Score 8.4high
Affected software
bitbonsai
mcpvault
pkg:github/bitbonsai/mcpvaultRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
MCPVault versions before 0.11.4 contain a path filtering vulnerability where restricted-directory patterns are compiled case-sensitively and paths are compared without canonicalizing equivalent filesystem segments. On case-insensitive filesystems such as macOS and Windows, attackers can use case variants or Windows-specific trailing dots/spaces to bypass checks in isAllowed() and isAllowedForListing(), gaining unauthorized read, write, move, search, or listing access to sensitive directories like .git, .obsidian, or node_modules. The vault-root containment via '..' is not affected. This vulnerability is resolved in version 0.11.4.
Potential Impact
An attacker able to influence paths selected by an AI agent can bypass directory restrictions on case-insensitive filesystems, potentially exposing or modifying sensitive repository and Obsidian metadata. This affects read, write, move, search, and listing operations. The vulnerability does not allow vault-root directory traversal via '..'. The CVSS 4.0 score is 8.4 (high severity), indicating significant impact with low attack complexity and no privileges required but user interaction needed.
Mitigation Recommendations
Upgrade mcpvault to version 0.11.4 or later, where this path equivalence resolution issue is fixed. No other mitigations are indicated by the vendor advisory. Patch status is confirmed fixed in 0.11.4.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-06-24T13:21:20.729Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6aa9882355bf5e2cf52fe310
Added to database: 09/15/2026, 18:02:11 UTC
Last enriched: 09/15/2026, 18:16:54 UTC
Last updated: 09/16/2026, 02:14:21 UTC
Views: 6
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