CVE-2026-23833

{"id": "CVE-2026-23833", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-23833", "role": "CISA Coordinator", "options": [{"exploitation": "poc"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-01-20T21:39:09.658572Z"}}], "cvssMetricV31": [{"type": "Primary", "source": "nvd@nist.gov", "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}], "cvssMetricV40": [{"type": "Secondary", "source": "security-advisories@github.com", "cvssData": {"Safety": "NOT_DEFINED", "version": "4.0", "Recovery": "NOT_DEFINED", "baseScore": 1.7, "Automatable": "NOT_DEFINED", "attackVector": "NETWORK", "baseSeverity": "LOW", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/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", "exploitMaturity": "UNREPORTED", "providerUrgency": "NOT_DEFINED", "userInteraction": "NONE", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "privilegesRequired": "NONE", "subIntegrityImpact": "NONE", "vulnIntegrityImpact": "NONE", "integrityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "vulnAvailabilityImpact": "LOW", "availabilityRequirement": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "subConfidentialityImpact": "NONE", "vulnConfidentialityImpact": "NONE", "confidentialityRequirement": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED"}}]}, "affected": [{"source": "security-advisories@github.com", "affectedData": [{"vendor": "esphome", "product": "esphome", "versions": [{"status": "affected", "version": ">= 2025.9.0, < 2025.12.7"}]}]}], "published": "2026-01-19T18:16:06.007", "references": [{"url": "https://esphome.io/guides/security_best_practices", "tags": ["Technical Description"], "source": "security-advisories@github.com"}, {"url": "https://github.com/esphome/esphome/commit/69d7b6e9210390051318bd8e6410727689de08d6", "tags": ["Patch"], "source": "security-advisories@github.com"}, {"url": "https://github.com/esphome/esphome/pull/13306", "tags": ["Issue Tracking", "Patch"], "source": "security-advisories@github.com"}, {"url": "https://github.com/esphome/esphome/security/advisories/GHSA-4h3h-63v6-88qx", "tags": ["Mitigation", "Patch", "Vendor Advisory"], "source": "security-advisories@github.com"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Secondary", "source": "security-advisories@github.com", "description": [{"lang": "en", "value": "CWE-190"}]}], "descriptions": [{"lang": "en", "value": "ESPHome is a system to control microcontrollers remotely through Home Automation systems. In versions 2025.9.0 through 2025.12.6, an integer overflow in the API component's protobuf decoder allows denial-of-service attacks when API encryption is not used. The bounds check `ptr + field_length > end` in `components/api/proto.cpp` can overflow when a malicious client sends a large `field_length` value. This affects all ESPHome device platforms (ESP32, ESP8266, RP2040, LibreTiny). The overflow bypasses the out-of-bounds check, causing the device to read invalid memory and crash. When using the plaintext API protocol, this attack can be performed without authentication. When noise encryption is enabled, knowledge of the encryption key is required. Users should upgrade to ESPHome 2025.12.7 or later to receive a patch, enable API encryption with a unique key per device, and follow the Security Best Practices."}, {"lang": "es", "value": "ESPHome es un sistema para controlar microcontroladores remotamente a trav\u00e9s de sistemas de automatizaci\u00f3n del hogar. En las versiones 2025.9.0 a 2025.12.6, un desbordamiento de entero en el decodificador protobuf del componente API permite ataques de denegaci\u00f3n de servicio cuando no se utiliza el cifrado de API. La comprobaci\u00f3n de l\u00edmites `ptr + field_length &gt; end` en `components/api/proto.cpp` puede desbordarse cuando un cliente malicioso env\u00eda un valor `field_length` grande. Esto afecta a todas las plataformas de dispositivos ESPHome (ESP32, ESP8266, RP2040, LibreTiny). El desbordamiento omite la comprobaci\u00f3n fuera de l\u00edmites, lo que provoca que el dispositivo lea memoria no v\u00e1lida y falle. Cuando se utiliza el protocolo API de texto plano, este ataque puede realizarse sin autenticaci\u00f3n. Cuando el cifrado de ruido est\u00e1 habilitado, se requiere conocimiento de la clave de cifrado. Los usuarios deben actualizar a ESPHome 2025.12.7 o posterior para recibir un parche, habilitar el cifrado de API con una clave \u00fanica por dispositivo y seguir las Mejores Pr\u00e1cticas de Seguridad."}], "lastModified": "2026-06-17T10:22:10.463", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:esphome:esphome:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "F8E39B6F-1F3D-4F50-B25F-5582CCDDD22D", "versionEndExcluding": "2025.12.7", "versionStartIncluding": "2025.9.0"}], "operator": "OR"}]}], "sourceIdentifier": "security-advisories@github.com"}