FKIE_CVE-2026-71255
Vulnerability from fkie_nvd - Published: 2026-08-05 12:18 - Updated: 2026-10-24 15:10| Vendor | Product | Version |
|---|
{
"affected": [
{
"affectedData": [
{
"defaultStatus": "unaffected",
"product": "nanoMODBUS",
"programFiles": [
"nanomodbus.c"
],
"vendor": "debevv",
"versions": [
{
"lessThanOrEqual": "1.23.0",
"status": "affected",
"version": "0",
"versionType": "semver"
}
]
}
],
"source": "309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c"
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "nanoMODBUS through v1.23.0 contains an out-of-bounds write in the Modbus client-side recv_read_device_identification_res function (FC 0x2B/MEI 0x0E, Read Device Identification) in nanomodbus.c. The server-supplied object_length field (0-246) is validated only against the remaining PDU size (res_size_left) and is never validated against the caller-supplied buffers_length parameter."
},
{
"lang": "es",
"value": "nanoMODBUS hasta la v1.23.0 contiene una escritura fuera de l\u00edmites en la funci\u00f3n recv_read_device_identification_res() del lado del cliente Modbus (FC 0x2B/MEI 0x0E, Identificaci\u00f3n de Lectura de Dispositivo) en nanomodbus.c. El campo object_length (0-246) suministrado por el servidor se valida solo contra el tama\u00f1o PDU restante (res_size_left) y nunca se valida contra el par\u00e1metro buffers_length suministrado por el llamador. Despu\u00e9s de copiar datos con strncpy(buffers_out[buf_index], str, buffers_length), el c\u00f3digo escribe incondicionalmente un terminador NUL en buffers_out[buf_index][object_length]. Cuando un servidor Modbus malicioso o comprometido env\u00eda una respuesta con object_length mayor o igual que el buffers_length del cliente, esta escritura NUL aterriza m\u00e1s all\u00e1 del final del b\u00fafer proporcionado por el llamador, corrompiendo la memoria adyacente de la pila o del mont\u00f3n en el cliente."
}
],
"id": "CVE-2026-71255",
"lastModified": "2026-10-24T15:10:00.190",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 8.6,
"baseSeverity": "HIGH",
"confidentialityImpact": "LOW",
"integrityImpact": "LOW",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H",
"version": "3.1"
},
"exploitabilityScore": 3.9,
"impactScore": 4.7,
"source": "309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c",
"type": "Secondary"
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"id": "CVE-2026-71255",
"options": [
{
"exploitation": "none"
},
{
"automatable": "yes"
},
{
"technicalImpact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-08-05T12:28:05.858513Z",
"version": "2.0.3"
}
}
]
},
"published": "2026-08-05T12:18:57.727",
"references": [
{
"source": "309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c",
"url": "https://github.com/debevv/nanoMODBUS"
},
{
"source": "309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c",
"url": "https://github.com/debevv/nanoMODBUS/blob/master/nanomodbus.c"
}
],
"sourceIdentifier": "309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c",
"vulnStatus": "Deferred",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-787"
}
],
"source": "309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c",
"type": "Secondary"
}
]
}
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