Vulnerability-Lookup

CVE-2026-57442 (GCVE-0-2026-57442)

Vulnerability from cvelistv5 – Published: 2026-09-15 17:50 – Updated: 2026-09-16 14:01

Title

MCPVault: PathFilter restricted directories (.git/.obsidian/node_modules) only denied at vault root, not nested

Summary

MCPVault is a lightweight Model Context Protocol server for safe access to files in an Obsidian vault. Prior to 0.11.5, PathFilter in src/pathfilter.ts uses root-anchored deny-list patterns, so nested .git, .obsidian, and node_modules path segments do not match the restriction and pass both isAllowed() and isAllowedForListing(). An attacker who influences a path selected by an AI agent can traverse nested repository or Obsidian metadata, read remote URLs or embedded tokens, or cause nested node_modules content to pollute the listAllTags index. This issue is fixed in version 0.11.5.

Severity

6.9 (Medium)


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

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-16 14:01 UTC

CWE

CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
CWE-538 - Insertion of Sensitive Information into Externally-Accessible File or Directory

Assigner

GitHub_M mitre root

References

4 references

URL	Tags
https://github.com/bitbonsai/mcpvault/security/ad…	x_refsource_CONFIRM
https://github.com/bitbonsai/mcpvault/issues/128	x_refsource_MISC
https://github.com/bitbonsai/mcpvault/commit/0adb…	x_refsource_MISC
https://github.com/bitbonsai/mcpvault/commit/8795…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
bitbonsai	mcpvault	Affected: < 0.11.5

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-57442

Vulnerability from fkie_nvd - Published: 2026-09-15 18:17 - Updated: 2026-09-30 17:51

Severity

6.9 (Medium) - CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/bitbonsai/mcpvault/commit/0adb43901e1a08e85e14b42a8df2442fabc0b64a
	security-advisories@github.com	https://github.com/bitbonsai/mcpvault/commit/8795716b90d1c4090a82a58647e030763513f17e
	security-advisories@github.com	https://github.com/bitbonsai/mcpvault/issues/128
	security-advisories@github.com	https://github.com/bitbonsai/mcpvault/security/advisories/GHSA-9c83-rr99-vfwj
	134c704f-9b21-4f2e-91b3-4a467353bcc0	https://github.com/bitbonsai/mcpvault/issues/128

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "mcpvault",
          "vendor": "bitbonsai",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 0.11.5"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "MCPVault is a lightweight Model Context Protocol server for safe access to files in an Obsidian vault. Prior to 0.11.5, PathFilter in src/pathfilter.ts uses root-anchored deny-list patterns, so nested .git, .obsidian, and node_modules path segments do not match the restriction and pass both isAllowed() and isAllowedForListing(). An attacker who influences a path selected by an AI agent can traverse nested repository or Obsidian metadata, read remote URLs or embedded tokens, or cause nested node_modules content to pollute the listAllTags index. This issue is fixed in version 0.11.5."
    }
  ],
  "id": "CVE-2026-57442",
  "lastModified": "2026-09-30T17:51:56.193",
  "metrics": {
    "cvssMetricV40": [
      {
        "cvssData": {
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "attackComplexity": "LOW",
          "attackRequirements": "NONE",
          "attackVector": "LOCAL",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 6.9,
          "baseSeverity": "MEDIUM",
          "confidentialityRequirement": "NOT_DEFINED",
          "exploitMaturity": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "privilegesRequired": "NONE",
          "providerUrgency": "NOT_DEFINED",
          "subAvailabilityImpact": "NONE",
          "subConfidentialityImpact": "NONE",
          "subIntegrityImpact": "NONE",
          "userInteraction": "PASSIVE",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
          "version": "4.0",
          "vulnAvailabilityImpact": "NONE",
          "vulnConfidentialityImpact": "HIGH",
          "vulnIntegrityImpact": "LOW",
          "vulnerabilityResponseEffort": "NOT_DEFINED"
        },
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-57442",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-09-16T14:01:44.030897Z",
          "version": "2.0.3"
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  "published": "2026-09-15T18:17:25.613",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/bitbonsai/mcpvault/commit/0adb43901e1a08e85e14b42a8df2442fabc0b64a"
    },
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      "url": "https://github.com/bitbonsai/mcpvault/commit/8795716b90d1c4090a82a58647e030763513f17e"
    },
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      "url": "https://github.com/bitbonsai/mcpvault/issues/128"
    },
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      "source": "security-advisories@github.com",
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    },
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    }
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  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Deferred",
  "weaknesses": [
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        {
          "lang": "en",
          "value": "CWE-22"
        },
        {
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      "type": "Secondary"
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  ]
}

GHSA-9C83-RR99-VFWJ

Vulnerability from github – Published: 2026-06-19 21:42 – Updated: 2026-07-20 21:31

Summary

MCPVault: PathFilter restricted directories (.git/.obsidian/node_modules) only denied at vault root, not nested

Details

PathFilter's deny-list glob patterns are anchored, so .git, .obsidian, and node_modules were only blocked at the vault root. Nested copies inside the vault (e.g. tools/cli/node_modules/..., tools/somerepo/.git/config, a nested .obsidian/) were fully traversable via isAllowed/isAllowedForListing. Impact: a nested .git/config (remote URLs / embedded tokens) and nested .obsidian contents could be read, under the same prompt-injection threat model as GHSA-j99q-93c9-h869 (an attacker influences the path an agent reads). It also caused nested node_modules to pollute the tag index (#128, the public symptom). Fixed in 0.11.5 by denying these restricted names at any path depth (matched case-insensitively as any path segment).

Severity

6.9 (Medium)


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

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "@bitbonsai/mcpvault"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.11.5"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-57442"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-22",
      "CWE-538"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-06-19T21:42:24Z",
    "nvd_published_at": null,
    "severity": "MODERATE"
  },
  "details": "PathFilter\u0027s deny-list glob patterns are anchored, so `.git`, `.obsidian`, and `node_modules` were only blocked at the vault root. Nested copies inside the vault (e.g. `tools/cli/node_modules/...`, `tools/somerepo/.git/config`, a nested `.obsidian/`) were fully traversable via isAllowed/isAllowedForListing. Impact: a nested `.git/config` (remote URLs / embedded tokens) and nested `.obsidian` contents could be read, under the same prompt-injection threat model as GHSA-j99q-93c9-h869 (an attacker influences the path an agent reads). It also caused nested `node_modules` to pollute the tag index (#128, the public symptom). Fixed in 0.11.5 by denying these restricted names at any path depth (matched case-insensitively as any path segment).",
  "id": "GHSA-9c83-rr99-vfwj",
  "modified": "2026-07-20T21:31:20Z",
  "published": "2026-06-19T21:42:24Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/bitbonsai/mcpvault/security/advisories/GHSA-9c83-rr99-vfwj"
    },
    {
      "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:N/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "MCPVault: PathFilter restricted directories (.git/.obsidian/node_modules) only denied at vault root, not nested"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
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.

Detection rules are retrieved from Rulezet.

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.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2026-57442 (GCVE-0-2026-57442)

FKIE_CVE-2026-57442

GHSA-9C83-RR99-VFWJ

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Related by attack behaviour