CVE-2026-70656

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{"affected": [{"affectedData": [{"product": "Checkmate", "vendor": "bluewave-labs", "versions": [{"status": "affected", "version": ">= 3.5.1, < 3.9.2"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Checkmate is an open-source, self-hosted tool designed to track and monitor server hardware, uptime, response times, and incidents in real-time with beautiful visualizations. From 3.5.1 until 3.9.2, an authenticated admin or superadmin can set matchMethod to regex and place a malicious expression in the expectedValue field for advanced HTTP monitor matching. server/src/api/validation/monitorValidation.ts accepts the expression, and server/src/service/network/AdvancedMatcher.ts synchronously evaluates it against an attacker-controlled HTTP response body on the Node.js main event loop without a timeout or worker isolation, allowing catastrophic backtracking to freeze API endpoints, monitor checks, and WebSocket connections for all users. This issue is fixed in version 3.9.2."}, {"lang": "es", "value": "Checkmate es una herramienta de c\u00f3digo abierto y autoalojada dise\u00f1ada para rastrear y monitorear el hardware del servidor, el tiempo de actividad, los tiempos de respuesta y los incidentes en tiempo real con hermosas visualizaciones. Desde la versi\u00f3n 3.5.1 hasta la 3.9.2, un administrador o superadministrador autenticado puede establecer matchMethod en regex e insertar una expresi\u00f3n maliciosa en el campo expectedValue para la coincidencia avanzada de monitores HTTP. server/src/api/validation/monitorValidation.ts acepta la expresi\u00f3n, y server/src/service/network/AdvancedMatcher.ts la eval\u00faa sincr\u00f3nicamente contra un cuerpo de respuesta HTTP controlado por el atacante en el bucle de eventos principal de Node.js sin un tiempo de espera o aislamiento de trabajadores, lo que permite que el retroceso catastr\u00f3fico congele los puntos finales de la API, las comprobaciones del monitor y las conexiones WebSocket para todos los usuarios. Este problema est\u00e1 solucionado en la versi\u00f3n 3.9.2."}], "id": "CVE-2026-70656", "lastModified": "2026-10-14T19:10:00.297", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 4.9, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "HIGH", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.2, "impactScore": 3.6, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-70656", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-08-21T18:06:46.856684Z", "version": "2.0.3"}}]}, "published": "2026-08-21T18:16:50.277", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/bluewave-labs/Checkmate/commit/0df71d6356c87c747e0b796b0c34e33f2a5203fa"}, {"source": "security-advisories@github.com", "url": "https://github.com/bluewave-labs/Checkmate/commit/adba25269c455878bf8065bc28cfe5d74e58692f"}, {"source": "security-advisories@github.com", "url": "https://github.com/bluewave-labs/Checkmate/commit/d5ec2936ad77ab773529057b442a6eb55dd578eb"}, {"source": "security-advisories@github.com", "url": "https://github.com/bluewave-labs/Checkmate/releases/tag/v3.9.2"}, {"source": "security-advisories@github.com", "url": "https://github.com/bluewave-labs/Checkmate/security/advisories/GHSA-4c6j-p2cv-wf56"}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "url": "https://github.com/bluewave-labs/Checkmate/security/advisories/GHSA-4c6j-p2cv-wf56"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-1333"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{}

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