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Back to active CVEs
High · CVSS 8.4CVE-2026-57441

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

Answer in brief

CVE-2026-57441 records a High severity (CVSS 8.4) vulnerability in MCPVault: PathFilter restricted-directory deny-list bypass via case and trailing dot/space equivalence. The current sources do not mark it as known exploited. The current feed maps bitbonsai/mcpvault (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 15, 2026Updated Sep 30, 2026Source checked Oct 31, 2026First seen by HOL Sep 15, 2026Material review Sep 30, 2026
Upstream Advisory

Key facts

Risk
High · CVSS 8.4
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Available

Why this deserves its current priority

CVSS is 8.4. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps bitbonsai/mcpvault (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
bitbonsai/mcpvaultgeneric<0.11.40.11.4

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for bitbonsai/mcpvault.
  2. 2Review the reported fix. Update bitbonsai/mcpvault to 0.11.4 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Sep 15, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Sep 30, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Sep 15, 2026

Sources and claim methodology

  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
Upstream source 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.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • Kubewarden trusted-repos-policy: uppercase registry host bypasses registry/image deny rulesAlso CWE-178

Record context

Vulnerability class
Tool Poisoning
EPSS
Not reported
CWE IDs
CWE-41, CWE-178
Source
CVE List V5
Source checked
Oct 31, 2026
References
3 linked sources
Open source record