Unrated

MCPVault PathFilter restricted-directory deny-list bypass

IdentifiersCVE-2026-57441CWE-178

CVE-2026-57441 is a path filtering vulnerability in the @bitbonsai/mcpvault package affecting PathFilter restricted-directory enforcement. The flaw arises from improper handling of case-insensitive filename matching and Windows path equivalence rules for trailing dots and spaces during deny-list checks. On case-insensitive filesystems, an attacker can supply path variants that evade restricted-directory matching and thereby access directories intended to be blocked, including sensitive project metadata and dependency directories. The vulnerability affects deny-list enforcement for file operations such as reading, writing, moving, searching, and directory listing. The vault-root containment check preventing traversal outside the vault using parent-directory references was not affected.

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ANALYST BRIEF

Impact, mitigation & remediation

What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.

Impact

What an attacker gets, and what they’ve been doing with it.

Successful exploitation allows bypass of restricted-directory protections within the vault on affected platforms. An attacker may gain unauthorized access to files and directories that administrators expected to be blocked, including the ability to list contents, search within them, read data, modify files, or move content depending on the exposed MCPVault operations. This can result in disclosure of sensitive repository metadata, workspace data, application dependencies, and integrity impacts to protected vault content.

Mitigation

If you can’t patch tonight, do this now.

Until the fixed version is deployed, do not rely on PathFilter deny-list enforcement to protect sensitive directories on case-insensitive filesystems, particularly macOS and Windows. Reduce exposure of vault contents through external access controls, limit available file operations to trusted users and components, and separately protect sensitive directories that would otherwise depend on PathFilter restrictions.

Remediation

Patch, then assume compromise.

Upgrade @bitbonsai/mcpvault to version 0.11.4 or later. The fixed release performs case-insensitive matching and per-path-segment canonicalization before applying restricted-directory deny-list checks, preventing bypass through case variation or Windows trailing dot and space normalization quirks.

PUBLIC EXPLOITS

Exploits

No public exploits tracked yet. Mallory keeps watching.

VALID 0 / 0 TOTALView more in app

No public exploit code observed for this vulnerability.

ACTIVITY FEED

Recent activity

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0 SOURCESView more in app

No public activity observed for this vulnerability.

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Exposure mapping

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Threat actor evidence

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Associated malware

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Detection signatures

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Vendor-by-vendor mapping

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Social activity