CVE-2026-10848
Full vulnerability record from the local CVENow database.
Description
The OCPP 1.6 client in subsys/net/lib/ocpp parsed inbound WAMP RPC frames in parse_rpc_msg() (subsys/net/lib/ocpp/ocpp_j.c) using a hand-rolled helper, extract_string_field(), that copied the message's uid and action fields with strncpy(out_buf, token + 1, outlen - 1) and then scanned the result with strchr(out_buf, '"'). Because strncpy does not NUL-terminate the destination when the source is at least outlen - 1 (127) bytes long, the subsequent strchr reads past the 128-byte destination buffer into adjacent stack memory; if a " byte is found beyond the buffer, a one-byte out-of-bounds NUL write also occurs. A related defect in extract_payload() runs strchr/strrchr over the receive buffer, which may not be NUL-terminated when a maximal-length frame fills it. The parsed bytes come directly from the OCPP central-system server over a websocket: the reader thread fills recv_buf via websocket_recv_msg() and calls parse_rpc_msg() on each inbound DATA frame (subsys/net/lib/ocpp/ocpp.c). A malicious or compromised central server, or an on-path attacker (OCPP is commonly deployed over plain ws://), can send an RPC frame whose uid or action field is 127+ bytes with no closing quote, triggering the out-of-bounds access. The primary impact is a remotely triggerable denial of service: the unbounded scan can fault on an unmapped page, and the stray NUL write can corrupt adjacent stack state. The over-read data is not reflected to the peer, so disclosure is limited. The feature is EXPERIMENTAL and must be explicitly enabled (CONFIG_OCPP). The fix replaces the manual parser with the bounds-respecting json_mixed_arr_parse() and copies the extracted uid with an explicitly NUL-terminated buffer, eliminating both over-reads.
View original CVE JSON
{
"id": "CVE-2026-10848",
"sourceIdentifier": "[email protected]",
"published": "2026-08-02T17:16:58.163",
"lastModified": "2026-10-23T22:10:00.160",
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"value": "The OCPP 1.6 client in subsys/net/lib/ocpp parsed inbound WAMP RPC frames in parse_rpc_msg() (subsys/net/lib/ocpp/ocpp_j.c) using a hand-rolled helper, extract_string_field(), that copied the message's uid and action fields with strncpy(out_buf, token + 1, outlen - 1) and then scanned the result with strchr(out_buf, '\"'). Because strncpy does not NUL-terminate the destination when the source is at least outlen - 1 (127) bytes long, the subsequent strchr reads past the 128-byte destination buffer into adjacent stack memory; if a \" byte is found beyond the buffer, a one-byte out-of-bounds NUL write also occurs. A related defect in extract_payload() runs strchr/strrchr over the receive buffer, which may not be NUL-terminated when a maximal-length frame fills it.\n\nThe parsed bytes come directly from the OCPP central-system server over a websocket: the reader thread fills recv_buf via websocket_recv_msg() and calls parse_rpc_msg() on each inbound DATA frame (subsys/net/lib/ocpp/ocpp.c). A malicious or compromised central server, or an on-path attacker (OCPP is commonly deployed over plain ws://), can send an RPC frame whose uid or action field is 127+ bytes with no closing quote, triggering the out-of-bounds access.\n\nThe primary impact is a remotely triggerable denial of service: the unbounded scan can fault on an unmapped page, and the stray NUL write can corrupt adjacent stack state. The over-read data is not reflected to the peer, so disclosure is limited. The feature is EXPERIMENTAL and must be explicitly enabled (CONFIG_OCPP). The fix replaces the manual parser with the bounds-respecting json_mixed_arr_parse() and copies the extracted uid with an explicitly NUL-terminated buffer, eliminating both over-reads."
},
{
"lang": "es",
"value": "El cliente OCPP 1.6 en subsys/net/lib/ocpp analizó tramas RPC WAMP entrantes en parse_rpc_msg() (subsys/net/lib/ocpp/ocpp_j.c) utilizando una función auxiliar personalizada, extract_string_field(), que copió los campos uid y action del mensaje con strncpy(out_buf, token + 1, outlen - 1) y luego escaneó el resultado con strchr(out_buf, ’“’). Debido a que strncpy no termina en NUL el destino cuando la fuente tiene al menos outlen - 1 (127) bytes de longitud, el strchr subsiguiente lee más allá del búfer de destino de 128 bytes hacia la memoria de pila adyacente; si se encuentra un byte ’”’ más allá del búfer, también ocurre una escritura NUL fuera de límites de un byte. Un defecto relacionado en extract_payload() ejecuta strchr/strrchr sobre el búfer de recepción, el cual podría no estar terminado en NUL cuando una trama de longitud máxima lo llena.\n\nLos bytes analizados provienen directamente del servidor del sistema central OCPP a través de un websocket: el hilo lector llena recv_buf a través de websocket_recv_msg() y llama a parse_rpc_msg() en cada trama DATA entrante (subsys/net/lib/ocpp/ocpp.c). Un servidor central malicioso o comprometido, o un atacante en la ruta (OCPP se implementa comúnmente sobre ws:// sin cifrar), puede enviar una trama RPC cuyo campo uid o action tenga 127+ bytes sin comilla de cierre, lo que desencadena el acceso fuera de límites.\n\nEl impacto principal es una denegación de servicio que puede ser activada remotamente: el escaneo ilimitado puede fallar en una página no mapeada, y la escritura NUL errante puede corromper el estado de pila adyacente. Los datos sobre-leídos no se reflejan al par, por lo que la divulgación es limitada. La característica es EXPERIMENTAL y debe ser habilitada explícitamente (CONFIG_OCPP). La solución reemplaza el analizador manual con json_mixed_arr_parse() que respeta los límites y copia el uid extraído con un búfer explícitamente terminado en NUL, eliminando ambas sobre-lecturas."
}
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