---
id: CVE-2026-10848
title: >-
  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(…
summary: >-
  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(…
severity: high
cvss: 7
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:H'
cwe:
  - CWE-125
  - CWE-787
published: '2026-08-02'
updated: '2026-08-02'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-10848'
references:
  - url: >-
      https://github.com/zephyrproject-rtos/zephyr/commit/e500f7b81b5b8a867e28b2f4e59512cbfdd5ae75
    label: vulnerabilities@zephyrproject.org
  - url: >-
      https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-jgqq-7mjj-w642
    label: vulnerabilities@zephyrproject.org
tags:
  - nvd
ingestedAt: '2026-08-02T17:18:46.963Z'
epss: 0.00376
epssPercentile: 0.28772
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.