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CVE-2026-57441— MCPVault: PathFilter restricted-directory deny-list bypass via case and trailing dot/space equivalence

Quick assessment

Affected
bitbonsai mcpvault
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

MCPVault 是一个轻量级的模型上下文协议（Model Context Protocol）服务器，用于安全地访问 Obsidian 仓库中的文件。 在 0.11.4 版本之前， 中的 以大小写敏感的方式编译受限制目录的模式，并在比较路径时未对文件系统等效的段名称进行规范化处理。在大小写不敏感的 macOS 和 Windows 文件系统中， 、 或 的大小写变体能够同时通过 和 的检查，尽管操作系统实际上会打开这些受限制目录；此外，Windows 中路径末尾的点或空格也提供了相同的绕过方式。 如果攻击者能够影响

CVSS 8.4 · High

Affected Version Matrix 1

VendorProduct Version RangeStatus
bitbonsai mcpvault < 0.11.4 affected
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I. Basic Information for CVE-2026-57441

Vulnerability Information
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Vulnerability Title
MCPVault: PathFilter restricted-directory deny-list bypass via case and trailing dot/space equivalence
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
对路径等价的解析不恰当
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
bitbonsai mcpvault < 0.11.4 -

II. Public POCs for CVE-2026-57441

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III. Intelligence Information for CVE-2026-57441

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Patches & Fixes for CVE-2026-57441 (2)

Vendor Advisories for CVE-2026-57441 (1)

IV. Related Vulnerabilities

Same product: mcpvault
Same vendor: bitbonsai
Same weakness: CWE-41

V. Comments for CVE-2026-57441

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