Vulnerability-Lookup

CVE-2026-84373 (GCVE-0-2026-84373)

Vulnerability from cvelistv5 – Published: 2026-09-01 21:26 – Updated: 2026-09-02 13:22

Title

Vitest: Path Traversal / Arbitrary File Read via @vitest/mocker Redirect Mock

Summary

Vitest is a testing framework powered by Vite. From 2.1.0 until 4.1.11 and 5.0.0-rc.2, the public mockerPlugin and standalone interceptorPlugin exports in packages/mocker/src/node/interceptorPlugin.ts register the vitest:interceptor:register handler on Vite's unauthenticated HMR WebSocket without validating redirect targets against the file-serving allowlist. The implementation processes event.redirect without enforcing server.fs.allow and server.fs.deny through isFileLoadingAllowed. A remote client that can reach an exposed development server can submit an opaque URL scheme preserving .. segments, causing join(server.config.root, redirectUrl.pathname) to resolve outside the project root. The plugin's load hook then returns readFile(mock.redirect, 'utf-8') as module source, disclosing local files readable by the dev-server process. Vitest browser mode uses a token-authenticated RPC and is not remotely unauthenticated by default, although the same boundary check was missing on that path. This issue is fixed in versions 4.1.11 and 5.0.0-rc.2.

Severity

5.9 (Medium)


                        
                          CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-02 13:20 UTC

CWE

CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Assigner

GitHub_M mitre root

References

8 references

URL	Tags
https://github.com/vitest-dev/vitest/security/adv…	x_refsource_CONFIRM
https://github.com/vitest-dev/vitest/pull/10972	x_refsource_MISC
https://github.com/vitest-dev/vitest/pull/10974	x_refsource_MISC
https://github.com/vitest-dev/vitest/commit/51edf…	x_refsource_MISC
https://github.com/vitest-dev/vitest/commit/8ff9b…	x_refsource_MISC
https://github.com/vitest-dev/vitest/commit/fe5a1…	x_refsource_MISC
https://github.com/vitest-dev/vitest/releases/tag…	x_refsource_MISC
https://github.com/vitest-dev/vitest/releases/tag…	x_refsource_MISC

Impacted products

2 products

Vendor	Product	Version	CPE status
vitest-dev	vitest	Affected: >= 2.1.0, < 4.1.11 Affected: >= 5.0.0-beta.1, < 5.0.0-rc.2	guessed
@vitest	mocker	Affected: >= 2.1.0, < 4.1.11 Affected: >= 5.0.0-beta.1, < 5.0.0-rc.2	guessed

Show details on NVD website

JSON

To clipboard

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                "id": "CVE-2026-84373",
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    "redhat_vex": {
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      "product_status:known_affected": "16",
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FKIE_CVE-2026-84373

Vulnerability from fkie_nvd - Published: 2026-09-01 22:17 - Updated: 2026-09-02 14:17

Severity

5.9 (Medium) - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/vitest-dev/vitest/commit/51edf2b072902aec6d30c90ebaafd8f121c6f9d8
	security-advisories@github.com	https://github.com/vitest-dev/vitest/commit/8ff9b9a9efca7c6cfd5243569440de8d7a33aec4
	security-advisories@github.com	https://github.com/vitest-dev/vitest/commit/fe5a11d3ceac5ec10d6d7d21a46d4caca132c48f
	security-advisories@github.com	https://github.com/vitest-dev/vitest/pull/10972
	security-advisories@github.com	https://github.com/vitest-dev/vitest/pull/10974
	security-advisories@github.com	https://github.com/vitest-dev/vitest/releases/tag/v4.1.11
	security-advisories@github.com	https://github.com/vitest-dev/vitest/releases/tag/v5.0.0-rc.2
	security-advisories@github.com	https://github.com/vitest-dev/vitest/security/advisories/GHSA-82fw-gwwq-j7x9

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "vitest",
          "vendor": "vitest-dev",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 2.1.0, \u003c 4.1.11"
            },
            {
              "status": "affected",
              "version": "\u003e= 5.0.0-beta.1, \u003c 5.0.0-rc.2"
            }
          ]
        },
        {
          "product": "mocker",
          "vendor": "@vitest",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 2.1.0, \u003c 4.1.11"
            },
            {
              "status": "affected",
              "version": "\u003e= 5.0.0-beta.1, \u003c 5.0.0-rc.2"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Vitest is a testing framework powered by Vite. From 2.1.0 until 4.1.11 and 5.0.0-rc.2, the public mockerPlugin and standalone interceptorPlugin exports in packages/mocker/src/node/interceptorPlugin.ts register the vitest:interceptor:register handler on Vite\u0027s unauthenticated HMR WebSocket without validating redirect targets against the file-serving allowlist. The implementation processes event.redirect without enforcing server.fs.allow and server.fs.deny through isFileLoadingAllowed. A remote client that can reach an exposed development server can submit an opaque URL scheme preserving .. segments, causing join(server.config.root, redirectUrl.pathname) to resolve outside the project root. The plugin\u0027s load hook then returns readFile(mock.redirect, \u0027utf-8\u0027) as module source, disclosing local files readable by the dev-server process. Vitest browser mode uses a token-authenticated RPC and is not remotely unauthenticated by default, although the same boundary check was missing on that path. This issue is fixed in versions 4.1.11 and 5.0.0-rc.2."
    }
  ],
  "id": "CVE-2026-84373",
  "lastModified": "2026-09-02T14:17:16.637",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 5.9,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 2.2,
        "impactScore": 3.6,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-84373",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-09-02T13:20:05.845961Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-09-01T22:17:19.143",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/vitest-dev/vitest/commit/51edf2b072902aec6d30c90ebaafd8f121c6f9d8"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/vitest-dev/vitest/commit/8ff9b9a9efca7c6cfd5243569440de8d7a33aec4"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/vitest-dev/vitest/commit/fe5a11d3ceac5ec10d6d7d21a46d4caca132c48f"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/vitest-dev/vitest/pull/10972"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/vitest-dev/vitest/pull/10974"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/vitest-dev/vitest/releases/tag/v4.1.11"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/vitest-dev/vitest/releases/tag/v5.0.0-rc.2"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/vitest-dev/vitest/security/advisories/GHSA-82fw-gwwq-j7x9"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Received",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-22"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}

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.

Action not permitted

CVE-2026-84373 (GCVE-0-2026-84373)

FKIE_CVE-2026-84373

Tags

Sightings

Nomenclature