CVE-2026-11826

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{"affected": [{"affectedData": [{"defaultStatus": "affected", "product": "OpenPLC_v3", "vendor": "openplcproject", "versions": [{"lessThanOrEqual": "b470206", "status": "affected", "version": "0", "versionType": "git"}]}], "source": "disclosure@vulncheck.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "OpenPLC_v3 contains a heap-based buffer overflow in the getData() function in webserver/core/modbus_master.cpp. getData() reads characters between two delimiters into a caller-supplied buffer with no size parameter and no bounds check. In parseConfig() the function is invoked with the 100-byte heap-allocated MB_device.dev_name field. An authenticated attacker with access to the OpenPLC web interface can send a crafted HTTP POST to the /modbus endpoint with an oversized device_name value; the value is persisted to mbconfig.cfg and parsed on load, overflowing dev_name and overwriting adjacent struct fields (protocol at offset 108, dev_address at offset 109, ip_port at offset 210). A 200-byte payload writes 100 bytes past the allocation. The result is heap corruption leading to runtime crash and denial of service of the PLC process control loop, with attacker-controlled overwrite of adjacent configuration fields. The upstream repository was archived on 2026-04-04 and no fix is expected; the vendor has confirmed the issue does not affect OpenPLC Runtime v4."}, {"lang": "es", "value": "OpenPLC_v3 contiene un desbordamiento de b\u00fafer basado en mont\u00edculo en la funci\u00f3n getData() en webserver/core/modbus_master.cpp. getData() lee caracteres entre dos delimitadores en un b\u00fafer proporcionado por el llamador sin par\u00e1metro de tama\u00f1o y sin verificaci\u00f3n de l\u00edmites. En parseConfig() la funci\u00f3n es invocada con el campo MB_device.dev_name de 100 bytes asignado en el mont\u00edculo. Un atacante autenticado con acceso a la interfaz web de OpenPLC puede enviar una solicitud HTTP POST manipulada al endpoint /modbus con un valor device_name sobredimensionado; el valor se persiste en mbconfig.cfg y se analiza al cargar, desbordando dev_name y sobrescribiendo campos de estructura adyacentes (protocolo en el desplazamiento 108, dev_address en el desplazamiento 109, ip_port en el desplazamiento 210). Una carga \u00fatil de 200 bytes escribe 100 bytes m\u00e1s all\u00e1 de la asignaci\u00f3n. El resultado es corrupci\u00f3n del mont\u00edculo que lleva a un fallo en tiempo de ejecuci\u00f3n y denegaci\u00f3n de servicio del bucle de control de proceso del PLC, con sobrescritura controlada por el atacante de campos de configuraci\u00f3n adyacentes. El repositorio upstream fue archivado el 04-04-2026 y no se espera ninguna soluci\u00f3n; el proveedor ha confirmado que el problema no afecta a OpenPLC Runtime v4."}], "id": "CVE-2026-11826", "lastModified": "2026-10-24T20:10:00.137", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 5.9, "source": "disclosure@vulncheck.com", "type": "Secondary"}], "cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 8.7, "baseSeverity": "HIGH", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "LOW", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "version": "4.0", "vulnAvailabilityImpact": "HIGH", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "disclosure@vulncheck.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-11826", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-07-20T17:02:00.553936Z", "version": "2.0.3"}}]}, "published": "2026-07-18T14:17:11.480", "references": [{"source": "disclosure@vulncheck.com", "url": "https://gist.github.com/Shukhrat-03/5cf1825b72e485ef98a32958dfbc611a#security-vulnerability-report"}, {"source": "disclosure@vulncheck.com", "url": "https://github.com/thiagoralves/OpenPLC_v3"}, {"source": "disclosure@vulncheck.com", "url": "https://github.com/thiagoralves/OpenPLC_v3/commit/b4702061dc14d1024856f71b4543298d77007b88"}, {"source": "disclosure@vulncheck.com", "url": "https://www.vulncheck.com/advisories/openplc-v3-heap-based-buffer-overflow-in-modbus-master-getdata"}], "sourceIdentifier": "disclosure@vulncheck.com", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-122"}], "source": "disclosure@vulncheck.com", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[0,b470206]"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "OpenPLC_v3", "source": "cna", "vendor": "openplcproject"}, "product": "openplc_v3", "vendor": "openplcproject"}], "created": "2026-07-20T23:30:03.455979+00:00", "updated": "2026-07-30T23:15:06.050791+00:00", "vendors": ["openplcproject", "openplcproject$PRODUCT$openplc_v3"]}