CVE-2026-57441 Details
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.
A vulnerability in MCPVault's PathFilter component allows for a restricted-directory bypass on case-insensitive filesystems, such as macOS and Windows. Prior to version 0.11.4, the PathFilter compiled deny-list patterns in a case-sensitive manner and compared paths without normalizing filesystem-equivalent segment names. This oversight enabled case variants of restricted directories like .git, .obsidian, or node_modules to pass through the filter, while the operating system accessed the actual directories. Additionally, on Windows, trailing dots or spaces could exploit the same bypass. An attacker manipulating a path chosen by an AI agent could leverage this flaw in various operations to access or alter sensitive repository and Obsidian metadata, although it does not affect vault-root containment.
Users can upgrade to MCPVault version 0.11.4 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 Sep 15, 2026CISA-ADP
Assessed Sep 15, 2026References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/bitbonsai/mcpvault/commit/0adb43901e1a08e85e14b42a8df2442fabc0b64a | [email protected] | Source CodeVendor |
| https://github.com/bitbonsai/mcpvault/commit/b9ea91a1c6d6adfec3e9e0483d9d79669e927fa8 | [email protected] | Source CodeVendor |
| https://github.com/bitbonsai/mcpvault/security/advisories/GHSA-j99q-93c9-h869 | [email protected] | AdvisoryRemedyVendor |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-178 | Improper Handling of Case Sensitivity | [email protected] |
| CWE-41 | Improper Resolution of Path Equivalence | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| bitbonsai MCPVault | < 0.11.4 (semver) |
CPE
Remediation
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Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Sep 15, 2026 | CVE Modified | CISA-ADP |
| Sep 15, 2026 | New CVE Received | [email protected] |