CVE-2026-10672

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The Firmware-Update object stores the server-supplied Package URI (/5/0/1) in a 255-byte buffer, so a LwM2M management server (or an on-path attacker on a session lacking strong DTLS) can WRITE a URI of 128-254 characters; only the first 128 bytes are then copied into context.uri with no NUL terminator. That buffer is subsequently consumed as a C string by http_parser_parse_url(context.uri, strlen(context.uri), ...), strlen-based CoAP URI-path/PROXY-URI option appends, and lwm2m_parse_peerinfo(), causing an out-of-bounds read of adjacent static memory. The over-read bytes are appended to outbound CoAP requests (information disclosure of adjacent device memory to the server/proxy) and can crash the device (denial of service). The vulnerable copy was introduced by the pull-context refactor (first released in v3.0.0) and is present through v4.4.0; the default-on CONFIG_LWM2M_FIRMWARE_UPDATE_PULL_SUPPORT path is affected. The fix adds a strlen(uri) >= sizeof(context.uri) check returning -ENOMEM and switches to strcpy(), guaranteeing a bounded, NUL-terminated buffer."}, {"lang": "es", "value": "subsys/net/lib/lwm2m/lwm2m_pull_context.c copi\u00f3 la URI del paquete de actualizaci\u00f3n de firmware en un b\u00fafer est\u00e1tico fijo (context.uri, tama\u00f1o CONFIG_LWM2M_SWMGMT_PACKAGE_URI_LEN, predeterminado 128) con memcpy(context.uri, uri, LWM2M_PACKAGE_URI_LEN), copiando exactamente el tama\u00f1o de destino sin validaci\u00f3n de longitud. El objeto de actualizaci\u00f3n de firmware almacena la URI del paquete proporcionada por el servidor (/5/0/1) en un b\u00fafer de 255 bytes, por lo que un servidor de gesti\u00f3n LwM2M (o un atacante en ruta en una sesi\u00f3n que carece de DTLS fuerte) puede ESCRIBIR una URI de 128-254 caracteres; solo los primeros 128 bytes se copian luego en context.uri sin terminador NUL. Ese b\u00fafer es consumido posteriormente como una cadena C por http_parser_parse_url(context.uri, strlen(context.uri), ...), adiciones de opciones CoAP URI-path/PROXY-URI basadas en strlen, y lwm2m_parse_peerinfo(), causando una lectura fuera de l\u00edmites de memoria est\u00e1tica adyacente. Los bytes le\u00eddos en exceso se a\u00f1aden a las solicitudes CoAP salientes (revelaci\u00f3n de informaci\u00f3n de la memoria adyacente del dispositivo al servidor/proxy) y pueden bloquear el dispositivo (denegaci\u00f3n de servicio). La copia vulnerable fue introducida por la refactorizaci\u00f3n de pull-context (lanzada por primera vez en v3.0.0) y est\u00e1 presente hasta la v4.4.0; la ruta CONFIG_LWM2M_FIRMWARE_UPDATE_PULL_SUPPORT, activada por defecto, est\u00e1 afectada. La soluci\u00f3n a\u00f1ade una comprobaci\u00f3n strlen(uri) >= sizeof(context.uri) que devuelve -ENOMEM y cambia a strcpy(), garantizando un b\u00fafer acotado y terminado en NUL."}], "id": "CVE-2026-10672", "lastModified": "2026-11-04T05:18:25.730", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "LOW", "baseScore": 8.2, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:L", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 4.2, "source": "vulnerabilities@zephyrproject.org", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.1, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 5.2, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-10672", "options": [{"exploitation": "poc"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-07-14T15:28:04.126168Z", "version": "2.0.3"}}]}, "published": "2026-07-14T15:16:55.560", "references": [{"source": "vulnerabilities@zephyrproject.org", "tags": ["Patch"], "url": "https://github.com/zephyrproject-rtos/zephyr/commit/99a164df5cea5af76e32b57c6d51854f018969a2"}, {"source": "vulnerabilities@zephyrproject.org", "tags": ["Exploit", "Mitigation", "Patch", "Vendor Advisory"], "url": "https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-rf6j-4mpp-j9mf"}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "tags": ["Exploit", "Mitigation", "Patch", "Vendor Advisory"], "url": "https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-rf6j-4mpp-j9mf"}], "sourceIdentifier": "vulnerabilities@zephyrproject.org", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-125"}], "source": "vulnerabilities@zephyrproject.org", "type": "Secondary"}]}

{}

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