CVE-2025-69873

{"id": "CVE-2025-69873", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Secondary", "source": "cve@mitre.org", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 2.9, "attackVector": "LOCAL", "baseSeverity": "LOW", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "HIGH", "availabilityImpact": "LOW", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}, "impactScore": 1.4, "exploitabilityScore": 1.4}, {"type": "Secondary", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.5, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}, "impactScore": 3.6, "exploitabilityScore": 3.9}]}, "published": "2026-02-11T19:15:50.467", "references": [{"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", "source": "cve@mitre.org"}], "vulnStatus": "Awaiting Analysis", "weaknesses": [{"type": "Secondary", "source": "cve@mitre.org", "description": [{"lang": "en", "value": "CWE-1333"}]}, {"type": "Secondary", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "description": [{"lang": "en", "value": "CWE-400"}]}], "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 'pattern' acepta datos en tiempo de ejecuci\u00f3n a trav\u00e9s de la sintaxis JSON Pointer (referencia $data), que se pasa directamente al constructor JavaScript RegExp() sin validaci\u00f3n. Un atacante puede inyectar un patr\u00f3n de expresi\u00f3n regular malicioso (por ejemplo, '^(a|a)*$') 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."}], "lastModified": "2026-03-02T21:16:24.213", "sourceIdentifier": "cve@mitre.org"}