MCPVault: PathFilter restricted directories (.git/.obsidian/node_modules) only denied at vault root, not nested
Key facts
- Attack vector
- Local
- Privileges required
- None
- User interaction
- Passive
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- —
- Confidentiality · integrity · availability
- High · Low · None
- Fix status
- Fixed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub.
Summary
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.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| bitbonsai | mcpvault | before 0.11.5 | 0.11.5 | Patch available | CNA |
| — | @bitbonsai/mcpvault (npm) | before 0.11.5 | 0.11.5 | Patch available | GHSA-9c83-rr99-vfwj |
- mcpvault Vendorbitbonsai Affected before 0.11.5 Fixed in 0.11.5 Patch available CNA
- @bitbonsai/mcpvault (npm) Vendor— Affected before 0.11.5 Fixed in 0.11.5 Patch available GHSA-9c83-rr99-vfwj
Remediation
- Fix · CNA mcpvault (bitbonsai) Fixed in 0.11.5
- Fix · GHSA-9c83-rr99-vfwj @bitbonsai/mcpvault (npm) Fixed in 0.11.5 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2026-57442
- 2026-10-03 Alias added: GHSA-9c83-rr99-vfwj
References
Other 5
- https://github.com/bitbonsai/mcpvault/security/advisories/GHSA-9c83-rr99-vfwj
- https://github.com/bitbonsai/mcpvault/issues/128
- https://github.com/bitbonsai/mcpvault/commit/0adb43901e1a08e85e14b42a8df2442fabc0b64a
- https://github.com/bitbonsai/mcpvault/commit/8795716b90d1c4090a82a58647e030763513f17e
- https://github.com/bitbonsai/mcpvault
More bitbonsai vulnerabilities
- TI-2026-41378 MCPVault: PathFilter restricted-directory deny-list bypass via case and trailing dot/space equivalence CVSS 4.0HIGH 8.4
Sources
- CVE-2026-57442 · CVE Program
- CVE-2026-57442 · NVD
- FIRST EPSS
- GHSA-9c83-rr99-vfwj · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences