# CVE-2026-57442

## Summary

- **CVE ID:** CVE-2026-57442
- **Severity:** MEDIUM
- **CVSS Score:** 6.9 (CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N)
- **CWE:** CWE-22, CWE-538
- **Published:** Sep 15, 2026
- **Last Modified:** Sep 16, 2026

## Description

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.

## Affected Products

- bitbonsai — mcpvault (< 0.11.5)

## References

- [CNA](https://github.com/bitbonsai/mcpvault/security/advisories/GHSA-9c83-rr99-vfwj)
- [CNA](https://github.com/bitbonsai/mcpvault/issues/128)
- [CNA](https://github.com/bitbonsai/mcpvault/commit/0adb43901e1a08e85e14b42a8df2442fabc0b64a)
- [CNA](https://github.com/bitbonsai/mcpvault/commit/8795716b90d1c4090a82a58647e030763513f17e)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.17%
- **EPSS Percentile:** 6.2

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-18._