{"id":"CVE-2026-13217","summary":"NULL-pointer dereference in Zephyr OCPP CALLRESULT parsing via unchecked strtok_r/atoi","details":"The OCPP 1.6 client in subsys/net/lib/ocpp/ocpp.c reconstructs a session handle and PDU id from the uid field of a CALLRESULT message. In ocpp_process_server_msg() the code calls atoi(strtok_r(uid, \"-\", &tmp)) without checking the strtok_r return value. When the server-supplied uid is empty or contains no - delimiter, strtok_r() returns NULL and atoi(NULL) dereferences a NULL pointer, which is undefined behaviour.\n\nThe uid originates from network data: parse_rpc_msg() in subsys/net/lib/ocpp/ocpp_j.c JSON-parses a frame received from the OCPP central system over TCP/WebSocket and copies the server-controlled string into the local buffer. A malicious or compromised central system, or a man-in-the-middle on a non-TLS ws:// connection, can return a malformed uid to reach the defect. No authentication beyond the existing server connection (or MITM position) is required, and the reconstructed pointer is membership-validated by ocpp_session_is_valid(), so the impact is limited to the NULL dereference rather than arbitrary pointer use.\n\nOn Zephyr targets that trap access to address 0 (MMU/MPU platforms or CONFIG_NULL_POINTER_EXCEPTION_DETECTION), the dereference faults inside the OCPP reader thread and invokes the fatal handler, producing a remote denial of service of the charge point; on bare targets where address 0 is readable the call returns 0 and is benign, so the impact is availability-only and platform-conditional.\n\nThe applied fix guards only the first atoi(); the second strtok_r(NULL, \"-\", &tmp) followed by pdu = atoi(buf) in the same function remains unguarded and the identical NULL dereference is still reachable from the same network input when the uid has a first token but no second --delimited token. A complete fix should validate the second token as well.","aliases":["GHSA-w234-pcxp-4q8r"],"modified":"2026-08-28T14:33:02.222273Z","published":"2026-08-25T16:05:38.128Z","database_specific":{"cna_assigner":"zephyr","cwe_ids":["CWE-476"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/13xxx/CVE-2026-13217.json"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/13xxx/CVE-2026-13217.json"},{"type":"ADVISORY","url":"https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-w234-pcxp-4q8r"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-13217"},{"type":"FIX","url":"https://github.com/zephyrproject-rtos/zephyr/commit/3a55507dd8011d877dc89eff949e70b42d45bacf"},{"type":"FIX","url":"https://github.com/zephyrproject-rtos/zephyr/commit/4d8a9eb1448061ccee557ef20a2a58aec91d9cad"},{"type":"PACKAGE","url":"https://github.com/zephyrproject-rtos/zephyr"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/zephyrproject-rtos/zephyr","events":[{"introduced":"3568e1b6d5cdd51a6b964a2a1d6d29200fea2056"},{"fixed":"3a55507dd8011d877dc89eff949e70b42d45bacf"},{"fixed":"4d8a9eb1448061ccee557ef20a2a58aec91d9cad"}],"database_specific":{"source":["AFFECTED_FIELD","REFERENCES"],"extracted_events":[{"introduced":"4.3.0"},{"fixed":"4.4.2"}]}}],"versions":["v4.4.0","v4.4.0-rc3","v4.4.0-rc2","v4.4.0-rc1","v4.3.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-13217.json","vanir_signatures_modified":"2026-08-28T14:33:02Z","vanir_signatures":[{"deprecated":false,"digest":{"line_hashes":["229340375586850807061659680568544851927","64582104775749143253322577667712423440","33967856936578847747430538556898151005","34653187361021109176327486033946330590"],"threshold":0.9},"id":"CVE-2026-13217-4c7d6a07","signature_type":"Line","signature_version":"v1","source":"https://github.com/zephyrproject-rtos/zephyr/commit/3a55507dd8011d877dc89eff949e70b42d45bacf","target":{"file":"subsys/net/lib/ocpp/ocpp.c"}},{"id":"CVE-2026-13217-94f117a6","signature_type":"Function","signature_version":"v1","source":"https://github.com/zephyrproject-rtos/zephyr/commit/4d8a9eb1448061ccee557ef20a2a58aec91d9cad","target":{"file":"subsys/net/lib/ocpp/ocpp.c","function":"ocpp_process_server_msg"},"deprecated":false,"digest":{"function_hash":"337637019550328805342545297644387687732","length":2849}},{"source":"https://github.com/zephyrproject-rtos/zephyr/commit/3a55507dd8011d877dc89eff949e70b42d45bacf","target":{"file":"subsys/net/lib/ocpp/ocpp.c","function":"ocpp_process_server_msg"},"deprecated":false,"digest":{"function_hash":"83163821473894983937132030747381855649","length":2890},"id":"CVE-2026-13217-cd0e56b3","signature_type":"Function","signature_version":"v1"},{"id":"CVE-2026-13217-e63aeb5f","signature_type":"Line","signature_version":"v1","source":"https://github.com/zephyrproject-rtos/zephyr/commit/4d8a9eb1448061ccee557ef20a2a58aec91d9cad","target":{"file":"subsys/net/lib/ocpp/ocpp.c"},"deprecated":false,"digest":{"line_hashes":["286132975026455062757246522182990937121","28520618197110131816743575688616680943","160042196479331764733102786265613726769","276038884985380193072322743815093030144"],"threshold":0.9}}]}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H"}]}