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CVE-2025-50537

Status: AnalyzedMedium (5.5)—

Stack overflow vulnerability in eslint before 9.26.0 when serializing objects with circular references in eslint/lib/shared/serialization.js. The exploit is triggered via the RuleTester.run() method, which validates test cases and checks for duplicates. During validation, the internal function checkDuplicateTestCase() is called, which in turn uses the isSerializable() function for serialization checks. When a circular reference object is passed in, isSerializable() enters infinite recursion, ultimately causing a stack overflow.

CVSS

Exploitation probability (EPSS)

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

Affected technologies (1)

Openjsf — Eslint

CWEs

References

Raw JSON (NVD)

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{
  "id": "CVE-2025-50537",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2025-50537",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-01-26T16:14:54.137910Z"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 5.5,
          "attackVector": "LOCAL",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "REQUIRED",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 1.8
      }
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  "affected": [
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      "source": "cve@mitre.org",
      "affectedData": [
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          "vendor": "n/a",
          "product": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
            }
          ]
        }
      ]
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  ],
  "published": "2026-01-26T16:15:58.330",
  "references": [
    {
      "url": "https://gist.github.com/lyyffee/2ee1815e5c2da82c05e9838b9bfefbbc",
      "tags": [
        "Third Party Advisory"
      ],
      "source": "cve@mitre.org"
    },
    {
      "url": "https://github.com/eslint/eslint/issues/19646",
      "tags": [
        "Exploit",
        "Issue Tracking",
        "Third Party Advisory"
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      "source": "cve@mitre.org"
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  "vulnStatus": "Analyzed",
  "weaknesses": [
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      "type": "Secondary",
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "description": [
        {
          "lang": "en",
          "value": "CWE-674"
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  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Stack overflow vulnerability in eslint before 9.26.0 when serializing objects with circular references in eslint/lib/shared/serialization.js. The exploit is triggered via the RuleTester.run() method, which validates test cases and checks for duplicates. During validation, the internal function checkDuplicateTestCase() is called, which in turn uses the isSerializable() function for serialization checks. When a circular reference object is passed in, isSerializable() enters infinite recursion, ultimately causing a stack overflow."
    },
    {
      "lang": "es",
      "value": "Vulnerabilidad de desbordamiento de pila en eslint anterior a la 9.26.0 al serializar objetos con referencias circulares en eslint/lib/shared/serialization.js. El exploit se activa a través del método RuleTester.run(), que valida los casos de prueba y busca duplicados. Durante la validación, se llama a la función interna checkDuplicateTestCase(), que a su vez utiliza la función isSerializable() para las comprobaciones de serialización. Cuando se pasa un objeto con referencia circular, isSerializable() entra en recursión infinita, lo que finalmente causa un desbordamiento de pila."
    }
  ],
  "lastModified": "2026-06-17T09:35:09.353",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:openjsf:eslint:*:*:*:*:*:node.js:*:*",
              "vulnerable": true,
              "matchCriteriaId": "F7AC358D-8192-4DFC-8039-5C0B0B14E714",
              "versionEndExcluding": "9.26.0"
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          "operator": "OR"
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      ]
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  ],
  "sourceIdentifier": "cve@mitre.org"
}