CVE-2026-57442 MCPVault: PathFilter restricted directories (.git/.obsidian/node_modules) only denied at vault root, not nested
An attacker can bypass path restrictions to read sensitive nested files like .git or .obsidian metadata in MCPVault.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-57442?
CVE-2026-57442 is a medium-severity path traversal vulnerability in bitbonsai mcpvault, published on 15 Sep 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official 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.
Which versions are affected by CVE-2026-57442?
2 open source packages ship an affected version, including @bitbonsai/mcpvault.
| Package | Affected | Fixed in |
|---|---|---|
@bitbonsai/mcpvault npm | All versions | 0.11.5 |
@bitbonsai/mcpvault npm | All versions | 0.11.5 |
How do I fix CVE-2026-57442?
Upgrade @bitbonsai/mcpvault to 0.11.5 or later.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2026-57442 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-57442 exists.
Sources
Also known as GHSA-9c83-rr99-vfwj.