CVE-2026-27703

{"id": "CVE-2026-27703", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Secondary", "source": "security-advisories@github.com", "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:H/A:N", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}, "impactScore": 3.6, "exploitabilityScore": 3.9}, {"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 9.8, "attackVector": "NETWORK", "baseSeverity": "CRITICAL", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}, "impactScore": 5.9, "exploitabilityScore": 3.9}]}, "published": "2026-03-11T20:16:14.990", "references": [{"url": "https://github.com/RIOT-OS/RIOT/security/advisories/GHSA-qgj4-9jff-93cj", "tags": ["Exploit", "Vendor Advisory"], "source": "security-advisories@github.com"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "security-advisories@github.com", "description": [{"lang": "en", "value": "CWE-787"}]}], "descriptions": [{"lang": "en", "value": "RIOT is an open-source microcontroller operating system, designed to match the requirements of Internet of Things (IoT) devices and other embedded devices. In 2026.01 and earlier, the default handler for the well_known_core resource coap_well_known_core_default_handler writes user-provided option data and other data into a fixed size buffer without validating the buffer is large enough to contain the response. This vulnerability allows an attacker to corrupt neighboring stack location, including security-sensitive addresses like the return address, leading to denial of service or arbitrary code execution."}, {"lang": "es", "value": "RIOT es un sistema operativo de microcontrolador de c\u00f3digo abierto, dise\u00f1ado para cumplir los requisitos de los dispositivos de Internet de las Cosas (IoT) y otros dispositivos embebidos. En 2026.01 y anteriores, el gestor predeterminado para el recurso well_known_core coap_well_known_core_default_handler escribe datos de opci\u00f3n proporcionados por el usuario y otros datos en un b\u00fafer de tama\u00f1o fijo sin validar que el b\u00fafer sea lo suficientemente grande para contener la respuesta. Esta vulnerabilidad permite a un atacante corromper ubicaciones de pila adyacentes, incluyendo direcciones sensibles a la seguridad como la direcci\u00f3n de retorno, lo que lleva a una denegaci\u00f3n de servicio o a la ejecuci\u00f3n de c\u00f3digo arbitrario."}], "lastModified": "2026-03-16T20:19:49.037", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:riot-os:riot:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "6DACBB75-13DE-4EC2-BAB6-60C361BE10C7", "versionEndIncluding": "2026.01"}], "operator": "OR"}]}], "sourceIdentifier": "security-advisories@github.com"}