FKIE_CVE-2025-69873

Vulnerability from fkie_nvd - Published: 2026-02-11 19:15 - Updated: 2026-06-17 10:00
Severity
2.9 (Low) - CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Summary
ajv (Another JSON Schema Validator) before 8.18.0 is vulnerable to Regular Expression Denial of Service (ReDoS) when the $data option is enabled. The pattern keyword accepts runtime data via JSON Pointer syntax ($data reference), which is passed directly to the JavaScript RegExp() constructor without validation. An attacker can inject a malicious regex pattern (e.g., "^(a|a)*$") combined with crafted input to cause catastrophic backtracking. A 31-character payload causes approximately 44 seconds of CPU blocking, with each additional character doubling execution time. This enables complete denial of service with a single HTTP request against any API using ajv with $data: true for dynamic schema validation. This issue is also fixed in version 6.14.0.
References
cve@mitre.orghttps://github.com/EthanKim88/ethan-cve-disclosures/blob/main/CVE-2025-69873-ajv-ReDoS.md
cve@mitre.orghttps://github.com/advisories/GHSA-2g4f-4pwh-qvx6
cve@mitre.orghttps://github.com/ajv-validator/ajv/pull/2588
cve@mitre.orghttps://github.com/ajv-validator/ajv/pull/2590
cve@mitre.orghttps://github.com/ajv-validator/ajv/releases/tag/v6.14.0
cve@mitre.orghttps://github.com/github/advisory-database/pull/6991
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "ajv",
          "vendor": "ajv.js",
          "versions": [
            {
              "lessThan": "6.14.0",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThan": "8.17.2",
              "status": "affected",
              "version": "7.0.0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "source": "cve@mitre.org"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "ajv (Another JSON Schema Validator) before 8.18.0 is vulnerable to Regular Expression Denial of Service (ReDoS) when the $data option is enabled. The pattern keyword accepts runtime data via JSON Pointer syntax ($data reference), which is passed directly to the JavaScript RegExp() constructor without validation. An attacker can inject a malicious regex pattern (e.g., \"^(a|a)*$\") combined with crafted input to cause catastrophic backtracking. A 31-character payload causes approximately 44 seconds of CPU blocking, with each additional character doubling execution time. This enables complete denial of service with a single HTTP request against any API using ajv with $data: true for dynamic schema validation. This issue is also fixed in version 6.14.0."
    },
    {
      "lang": "es",
      "value": "ajv (Another JSON Schema Validator) hasta la versi\u00f3n 8.17.1 es vulnerable a la denegaci\u00f3n de servicio por expresiones regulares (ReDoS) cuando la opci\u00f3n $data est\u00e1 habilitada. La palabra clave \u0027pattern\u0027 acepta datos en tiempo de ejecuci\u00f3n a trav\u00e9s de la sintaxis JSON Pointer (referencia $data), que se pasa directamente al constructor JavaScript RegExp() sin validaci\u00f3n. Un atacante puede inyectar un patr\u00f3n de expresi\u00f3n regular malicioso (por ejemplo, \u0027^(a|a)*$\u0027) combinado con una entrada manipulada para causar un retroceso catastr\u00f3fico. Una carga \u00fatil de 31 caracteres causa aproximadamente 44 segundos de bloqueo de CPU, y cada car\u00e1cter adicional duplica el tiempo de ejecuci\u00f3n. Esto permite una denegaci\u00f3n de servicio completa con una \u00fanica solicitud HTTP contra cualquier API que utilice ajv con $data: true para la validaci\u00f3n din\u00e1mica de esquemas."
    }
  ],
  "id": "CVE-2025-69873",
  "lastModified": "2026-06-17T10:00:54.653",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "LOCAL",
          "availabilityImpact": "LOW",
          "baseScore": 2.9,
          "baseSeverity": "LOW",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L",
          "version": "3.1"
        },
        "exploitabilityScore": 1.4,
        "impactScore": 1.4,
        "source": "cve@mitre.org",
        "type": "Secondary"
      },
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 3.6,
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2025-69873",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-02-12T15:13:03.482882Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-02-11T19:15:50.467",
  "references": [
    {
      "source": "cve@mitre.org",
      "url": "https://github.com/EthanKim88/ethan-cve-disclosures/blob/main/CVE-2025-69873-ajv-ReDoS.md"
    },
    {
      "source": "cve@mitre.org",
      "url": "https://github.com/advisories/GHSA-2g4f-4pwh-qvx6"
    },
    {
      "source": "cve@mitre.org",
      "url": "https://github.com/ajv-validator/ajv/pull/2588"
    },
    {
      "source": "cve@mitre.org",
      "url": "https://github.com/ajv-validator/ajv/pull/2590"
    },
    {
      "source": "cve@mitre.org",
      "url": "https://github.com/ajv-validator/ajv/releases/tag/v6.14.0"
    },
    {
      "source": "cve@mitre.org",
      "url": "https://github.com/github/advisory-database/pull/6991"
    }
  ],
  "sourceIdentifier": "cve@mitre.org",
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-1333"
        }
      ],
      "source": "cve@mitre.org",
      "type": "Secondary"
    },
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-400"
        }
      ],
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "type": "Secondary"
    }
  ]
}


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