CVE-2026-10666
Full vulnerability record from the local CVENow database.
Description
parse_ipv4() in subsys/net/ip/utils.c (reached via net_ipaddr_parse() for strings of the form "a.b.c.d:port") copies the port substring into a fixed 17-byte stack buffer (char ipaddr[NET_IPV4_ADDR_LEN + 1]) using a length of str_len - end - 1, where str_len is the full, unbounded input length and end is only the (<=15-byte) offset of the ':' delimiter. Because the destination size is never consulted, a crafted address string with a long suffix after the colon (e.g. "1.2.3.4:" followed by hundreds of bytes) causes an out-of-bounds stack write whose length and contents are fully attacker-controlled (memcpy of the suffix plus a trailing NUL), enabling memory corruption and at minimum a denial of service, and potentially control-flow hijack. The parser is reached from the standard socket API (zsock_getaddrinfo / literal-address resolution), DNS server-string configuration, and the eswifi Wi-Fi co-processor DNS-response path, so an application that resolves a network-influenced address string is exposed. The bug was introduced when the parser was added (Zephyr v1.9.0) and shipped in all releases through v4.4.0. The fix removes the unbounded copy and validates the port length before copying into a small dedicated buffer. Note: the equivalent IPv6 "[addr]:port" path in parse_ipv6() retains the same unbounded copy at this commit and remains a separate, still-reachable instance of the defect.
Severity
CRITICAL
CVSS score
9.8
(v3.1)
Vulnerability status
Analyzed
Source identifier
Published
2026-07-12 17:16:24.550000
Last modified
2026-10-24 22:10:00.210000
View original CVE JSON
{
"id": "CVE-2026-10666",
"sourceIdentifier": "[email protected]",
"published": "2026-07-12T17:16:24.550",
"lastModified": "2026-10-24T22:10:00.210",
"vulnStatus": "Analyzed",
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "parse_ipv4() in subsys/net/ip/utils.c (reached via net_ipaddr_parse() for strings of the form \"a.b.c.d:port\") copies the port substring into a fixed 17-byte stack buffer (char ipaddr[NET_IPV4_ADDR_LEN + 1]) using a length of str_len - end - 1, where str_len is the full, unbounded input length and end is only the (<=15-byte) offset of the ':' delimiter. Because the destination size is never consulted, a crafted address string with a long suffix after the colon (e.g. \"1.2.3.4:\" followed by hundreds of bytes) causes an out-of-bounds stack write whose length and contents are fully attacker-controlled (memcpy of the suffix plus a trailing NUL), enabling memory corruption and at minimum a denial of service, and potentially control-flow hijack. The parser is reached from the standard socket API (zsock_getaddrinfo / literal-address resolution), DNS server-string configuration, and the eswifi Wi-Fi co-processor DNS-response path, so an application that resolves a network-influenced address string is exposed. The bug was introduced when the parser was added (Zephyr v1.9.0) and shipped in all releases through v4.4.0. The fix removes the unbounded copy and validates the port length before copying into a small dedicated buffer. Note: the equivalent IPv6 \"[addr]:port\" path in parse_ipv6() retains the same unbounded copy at this commit and remains a separate, still-reachable instance of the defect."
},
{
"lang": "es",
"value": "parse_ipv4() en subsys/net/ip/utils.c (alcanzado a través de net_ipaddr_parse() para cadenas de la forma ’a.b.c.d:port’) copia la subcadena del puerto en un búfer de pila fijo de 17 bytes (char ipaddr[NET_IPV4_ADDR_LEN + 1]) usando una longitud de str_len - end - 1, donde str_len es la longitud de entrada completa y sin límites y end es solo el desplazamiento (menor o igual que 15 bytes) del delimitador ’:’. Debido a que el tamaño de destino nunca se consulta, una cadena de dirección manipulada con un sufijo largo después de los dos puntos (por ejemplo, ’1.2.3.4:’ seguido de cientos de bytes) causa una escritura fuera de límites en la pila cuya longitud y contenido están totalmente controlados por el atacante (memcpy del sufijo más un NUL final), lo que permite la corrupción de memoria y, como mínimo, una denegación de servicio, y potencialmente un secuestro del flujo de control. El analizador se alcanza desde la API de socket estándar (zsock_getaddrinfo / resolución de dirección literal), la configuración de cadena de servidor DNS y la ruta de respuesta DNS del coprocesador Wi-Fi eswifi, por lo que una aplicación que resuelve una cadena de dirección influenciada por la red está expuesta. El error se introdujo cuando se añadió el analizador (Zephyr v1.9.0) y se distribuyó en todas las versiones hasta la v4.4.0. La corrección elimina la copia sin límites y valida la longitud del puerto antes de copiar en un pequeño búfer dedicado. Nota: la ruta IPv6 equivalente ’[addr]:port’ en parse_ipv6() retiene la misma copia sin límites en este commit y sigue siendo una instancia separada y aún alcanzable del defecto."
}
],
"affected": [
{
"source": "[email protected]",
"affectedData": [
{
"vendor": "zephyrproject",
"product": "zephyr",
"defaultStatus": "unaffected",
"collectionURL": "https://github.com/zephyrproject-rtos/zephyr",
"packageName": "zephyr",
"programFiles": [
"subsys/net/ip/utils.c"
],
"versions": [
{
"version": "1.9.0",
"lessThan": "4.3.1",
"versionType": "semver",
"status": "affected"
},
{
"version": "4.4.0",
"lessThan": "4.4.1",
"versionType": "semver",
"status": "affected"
}
]
}
]
}
],
"metrics": {
"cvssMetricV31": [
{
"source": "[email protected]",
"type": "Secondary",
"cvssData": {
"version": "3.1",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
"baseScore": 8.1,
"baseSeverity": "HIGH",
"attackVector": "NETWORK",
"attackComplexity": "HIGH",
"privilegesRequired": "NONE",
"userInteraction": "NONE",
"scope": "UNCHANGED",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"availabilityImpact": "HIGH"
},
"exploitabilityScore": 2.2,
"impactScore": 5.9
},
{
"source": "[email protected]",
"type": "Primary",
"cvssData": {
"version": "3.1",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"baseScore": 9.8,
"baseSeverity": "CRITICAL",
"attackVector": "NETWORK",
"attackComplexity": "LOW",
"privilegesRequired": "NONE",
"userInteraction": "NONE",
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"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"timestamp": "2026-07-13T16:04:57.176740Z",
"id": "CVE-2026-10666",
"options": [
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{
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"role": "CISA Coordinator",
"version": "2.0.3"
}
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},
"weaknesses": [
{
"source": "[email protected]",
"type": "Secondary",
"description": [
{
"lang": "en",
"value": "CWE-121"
}
]
}
],
"configurations": [
{
"nodes": [
{
"operator": "OR",
"negate": false,
"cpeMatch": [
{
"vulnerable": true,
"criteria": "cpe:2.3:o:zephyrproject:zephyr:*:*:*:*:*:*:*:*",
"versionStartIncluding": "1.9.0",
"versionEndIncluding": "4.4.1",
"matchCriteriaId": "82FE267F-C88E-42A5-A503-69ECB6A7879A"
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"references": [
{
"url": "https://github.com/zephyrproject-rtos/zephyr/commit/1c8d19a51f9a3c1be6de53854c8ad8c2720a0f48",
"source": "[email protected]",
"tags": [
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},
{
"url": "https://github.com/zephyrproject-rtos/zephyr/commit/6e119a636a57be449ea21e73cad762ebc6f5ff7a",
"source": "[email protected]",
"tags": [
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},
{
"url": "https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-532c-7g7f-jhmh",
"source": "[email protected]",
"tags": [
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"Patch",
"Vendor Advisory"
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{
"url": "https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-532c-7g7f-jhmh",
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}