{"id":"CVE-2026-57441","summary":"MCPVault: PathFilter restricted-directory deny-list bypass via case and trailing dot/space equivalence","details":"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.","aliases":["GHSA-j99q-93c9-h869"],"modified":"2026-09-17T03:46:54.053611714Z","published":"2026-09-15T17:49:10.118Z","database_specific":{"unresolved_ranges":[{"extracted_events":[{"fixed":"0.11.4"}],"source":"AFFECTED_FIELD"}],"cna_assigner":"GitHub_M","cwe_ids":["CWE-178","CWE-41"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/57xxx/CVE-2026-57441.json"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/57xxx/CVE-2026-57441.json"},{"type":"ADVISORY","url":"https://github.com/bitbonsai/mcpvault/security/advisories/GHSA-j99q-93c9-h869"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-57441"},{"type":"FIX","url":"https://github.com/bitbonsai/mcpvault/commit/0adb43901e1a08e85e14b42a8df2442fabc0b64a"},{"type":"FIX","url":"https://github.com/bitbonsai/mcpvault/commit/b9ea91a1c6d6adfec3e9e0483d9d79669e927fa8"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/bitbonsai/mcpvault","events":[{"introduced":"0"},{"fixed":"0adb43901e1a08e85e14b42a8df2442fabc0b64a"},{"fixed":"b9ea91a1c6d6adfec3e9e0483d9d79669e927fa8"}],"database_specific":{"source":"REFERENCES"}}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-57441.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"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"}]}