Vulnerability-Lookup

GHSA-J99Q-93C9-H869

Vulnerability from github – Published: 2026-06-18 14:30 – Updated: 2026-07-20 21:30

Summary

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

Details

On case-insensitive filesystems (macOS, Windows), PathFilter compiled its deny-list patterns case-sensitively and matched the path verbatim, so names like .Git/config, .GIT/config, or .oBsIdIaN/secrets.md slipped past the .git/.obsidian/node_modules restriction while the OS opened the real file. On Windows, trailing dots/spaces (.git./config, .git /config) bypassed it the same way. Affects both isAllowed (read/write/move/search) and isAllowedForListing. Vault-root .. containment is NOT affected. Fixed in 0.11.4 by case-insensitive matching plus per-segment canonicalization before the deny-list check. Reported privately by novice-22.

Severity

6.9 (Medium)


                  
                    CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N

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{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "@bitbonsai/mcpvault"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.11.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-57441"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-178",
      "CWE-41"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-06-18T14:30:43Z",
    "nvd_published_at": null,
    "severity": "MODERATE"
  },
  "details": "On case-insensitive filesystems (macOS, Windows), PathFilter compiled its deny-list patterns case-sensitively and matched the path verbatim, so names like `.Git/config`, `.GIT/config`, or `.oBsIdIaN/secrets.md` slipped past the `.git`/`.obsidian`/`node_modules` restriction while the OS opened the real file. On Windows, trailing dots/spaces (`.git./config`, `.git /config`) bypassed it the same way. Affects both `isAllowed` (read/write/move/search) and `isAllowedForListing`. Vault-root `..` containment is NOT affected. Fixed in 0.11.4 by case-insensitive matching plus per-segment canonicalization before the deny-list check. Reported privately by novice-22.",
  "id": "GHSA-j99q-93c9-h869",
  "modified": "2026-07-20T21:30:52Z",
  "published": "2026-06-18T14:30:43Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/bitbonsai/mcpvault/security/advisories/GHSA-j99q-93c9-h869"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/bitbonsai/mcpvault"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "MCPVault: PathFilter restricted-directory deny-list bypass via case and trailing dot/space equivalence"
}

CVE-2026-57441 (GCVE-0-2026-57441)

Vulnerability from cvelistv5 – Published: 2026-09-15 17:49 – Updated: 2026-09-15 19:43

Title

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

Summary

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.

Severity

8.4 (High)


                        
                          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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-15 18:57 UTC

CWE

CWE-41 - Improper Resolution of Path Equivalence
CWE-178 - Improper Handling of Case Sensitivity

Assigner

GitHub_M CNA under the mitre root

CNA scorecard C 72/100 over 7521 records in the last 180 days details

References

3 references

URL	Tags
https://github.com/bitbonsai/mcpvault/security/ad…	x_refsource_CONFIRM
https://github.com/bitbonsai/mcpvault/commit/0adb…	x_refsource_MISC
https://github.com/bitbonsai/mcpvault/commit/b9ea…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
bitbonsai	mcpvault	Affected: < 0.11.4

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JSON

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{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-57441",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-09-15T18:57:31.418875Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-09-15T19:43:58.303Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "mcpvault",
          "vendor": "bitbonsai",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 0.11.4"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "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."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "LOCAL",
            "baseScore": 8.4,
            "baseSeverity": "HIGH",
            "privilegesRequired": "NONE",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "PASSIVE",
            "vectorString": "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",
            "version": "4.0",
            "vulnAvailabilityImpact": "LOW",
            "vulnConfidentialityImpact": "HIGH",
            "vulnIntegrityImpact": "HIGH"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-41",
              "description": "CWE-41: Improper Resolution of Path Equivalence",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-178",
              "description": "CWE-178: Improper Handling of Case Sensitivity",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-15T17:49:10.118Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/bitbonsai/mcpvault/security/advisories/GHSA-j99q-93c9-h869",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/bitbonsai/mcpvault/security/advisories/GHSA-j99q-93c9-h869"
        },
        {
          "name": "https://github.com/bitbonsai/mcpvault/commit/0adb43901e1a08e85e14b42a8df2442fabc0b64a",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/bitbonsai/mcpvault/commit/0adb43901e1a08e85e14b42a8df2442fabc0b64a"
        },
        {
          "name": "https://github.com/bitbonsai/mcpvault/commit/b9ea91a1c6d6adfec3e9e0483d9d79669e927fa8",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/bitbonsai/mcpvault/commit/b9ea91a1c6d6adfec3e9e0483d9d79669e927fa8"
        }
      ],
      "source": {
        "advisory": "GHSA-j99q-93c9-h869",
        "discovery": "UNKNOWN"
      },
      "title": "MCPVault: PathFilter restricted-directory deny-list bypass via case and trailing dot/space equivalence"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-57441",
    "datePublished": "2026-09-15T17:49:10.118Z",
    "dateReserved": "2026-06-24T13:21:20.729Z",
    "dateUpdated": "2026-09-15T19:43:58.303Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

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Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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GHSA-J99Q-93C9-H869

CVE-2026-57441 (GCVE-0-2026-57441)

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