Vulnerability · Published Sep 15, 2026 · Assigned by GitHub_M

CVE-2026-57442MCPVault: PathFilter restricted directories (.git/.obsidian/node_modules) only denied at vault root, not nested

Medium 6.9

In plain English

A medium-severity path traversal in mcpvault from bitbonsai. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 9% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)6.9Medium

Exploit odds (30 days)0.2%top 91.1% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
npm	@bitbonsai/mcpvault	0.11.5	GHSA-9c83-rr99-vfwj

Affected products (as reported)

Vendor	Product	Versions
bitbonsai	mcpvault	< 0.11.5

Weakness: CWE-22, CWE-538 · Vector: 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

References

https://github.com/bitbonsai/mcpvault/security/advisories/GHSA-9c83-rr99-vfwj x_refsource_CONFIRM
https://github.com/bitbonsai/mcpvault/issues/128 x_refsource_MISC
https://github.com/bitbonsai/mcpvault/commit/0adb43901e1a08e85e14b42a8df2442fabc0b64a x_refsource_MISC
https://github.com/bitbonsai/mcpvault/commit/8795716b90d1c4090a82a58647e030763513f17e x_refsource_MISC