{"id":"CVE-2026-13214","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-13214","summary":"The OCPP 1.6 client in subsys/net/lib/ocpp/ocpp_j.c contains a stack buffer overflow in parse_getconfig_msg(). When handling a GetConfiguration request from the central system, the…","details":"The OCPP 1.6 client in subsys/net/lib/ocpp/ocpp_j.c contains a stack buffer overflow in parse_getconfig_msg(). When handling a GetConfiguration request from the central system, the handler copied the attacker-controlled JSON \"key\" string into the caller's fixed 50-byte stack buffer (skey[CISTR50], declared in subsys/net/lib/ocpp/ocpp.c) using an unbounded strcpy(). The parsed key value points directly into the receive buffer, so its length is bounded only by the message size (CONFIG_OCPP_RECV_BUFFER_SIZE, default 2048).\n\nThe GetConfiguration message is delivered over the WebSocket connection that the charge point opens to its configured central system. The reader thread ocpp_wsreader() reads the message into ui->recv_buf and dispatches it to parse_getconfig_msg() via the PDU function table. An attacker who controls the central system endpoint, or a man-in-the-middle on an unencrypted connection, can send a GetConfiguration request whose \"key\" field exceeds 50 bytes and overflow the reader thread's stack with attacker-chosen bytes.\n\nThe consequence is a remotely triggerable stack smash on the OCPP reader thread: at minimum a denial of service, and plausibly remote code execution depending on build-time hardening such as stack canaries and MPU configuration. The fix replaces the strcpy() with a bounded strncpy(key, payload.key[0], CISTR50 - 1) followed by explicit NUL termination, matching the bounded copies already used by the sibling handlers.","published":"2026-08-25T05:17:20.060","modified":"2026-08-25T16:16:45.770","cvss":{"score":9.8,"severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[],"fix":{"url":"https://github.com/zephyrproject-rtos/zephyr/commit/afbf880b04188ae53451a0ade4ac62b654fdff34","label":"zephyrproject-rtos/zephyr@afbf880"},"references":[{"type":"WEB","url":"https://github.com/zephyrproject-rtos/zephyr/commit/afbf880b04188ae53451a0ade4ac62b654fdff34"},{"type":"WEB","url":"https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-fqhf-6v24-4px2"}],"provenance":{"sources":["OSV.dev","NVD","FIRST.org (EPSS)"],"lastVerified":"2026-08-25T16:16:45.770"}}