{"id":"CVE-2026-19741","revision":null,"records":[{"revision":"df343f28906446e5be7b0dd3ec0a52fd","observedAt":"2026-10-23T20:48:20.645+00:00","statement":{"source":"cve-program","id":"CVE-2026-19741","aliases":[],"title":"OpenThread joiner autostart uses a publicly documented default Joining Device Credential (PSKd)","description":"Zephyr's OpenThread integration defined CONFIG_OPENTHREAD_JOINER_PSKD with default \"J01NME\" in modules/openthread/Kconfig.thread (previously subsys/net/l2/openthread/Kconfig, then subsys/net/l2/openthread/Kconfig.thread). J01NME is the example Joining Device Credential used throughout the public OpenThread and Thread commissioning documentation, including Zephyr's own samples/net/sockets/echo_client/README.rst, so it is not a secret. A firmware image built with CONFIG_OPENTHREAD_JOINER_AUTOSTART=y that never overrode the PSKd therefore shipped with a publicly known joining credential compiled in, with no build-time or run-time warning.\n\nThe PSKd is the only value that authenticates Thread commissioning: joiner and commissioner run a DTLS-PSK handshake keyed on it, after which the commissioner supplies the full operational dataset. In ot_configure_instance() (modules/openthread/openthread.c), a device with no stored dataset calls otJoinerStart() with the configured PSKd, and ot_joiner_start_handler() calls otThreadSetEnabled() on success. An unauthenticated attacker within 802.15.4 radio range of an uncommissioned device (factory-fresh, after a factory reset, or after a settings erase) can run any stock Thread commissioner registered with J01NME, complete the handshake, and hand the device an attacker-controlled operational dataset.\n\nThe device then joins and enables Thread on the attacker's mesh. The attacker becomes its router, seeing, dropping, injecting and spoofing all of the device's IPv6 traffic and impersonating the peers the application expects, while the device is cut off from the network it was meant to join and stays mis-provisioned until it is reset. Only application-layer security with independently provisioned credentials survives. Exposure is limited to builds that enable joiner autostart and leave the PSKd unset; the option is not enabled by default and no in-tree sample uses the vulnerable combination.\n\nThe fix removes the default from CONFIG_OPENTHREAD_JOINER_PSKD and adds a BUILD_ASSERT() in modules/openthread/openthread.c, active only under CONFIG_OPENTHREAD_JOINER_AUTOSTART, that fails the build unless a 6-to-32-character PSKd is configured. Products should provision a per-device PSKd from factory data and call otJoinerStart() from the application rather than relying on a credential compiled identically into every unit.","state":0,"publishedAt":"2026-10-23T19:56:12.805+00:00","modifiedAt":"2026-10-23T19:56:12.805+00:00","affected":[{"ecosystem":"https://github.com/zephyrproject-rtos/zephyr","name":"zephyr","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"zephyrproject\",\n                    \"product\": \"zephyr\",\n                    \"collectionURL\": \"https://github.com/zephyrproject-rtos/zephyr\",\n                    \"packageName\": \"zephyr\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"programFiles\": [\n                        \"modules/openthread/Kconfig.thread\",\n                        \"modules/openthread/openthread.c\",\n                        \"subsys/net/l2/openthread/Kconfig\",\n                        \"subsys/net/l2/openthread/Kconfig.thread\",\n                        \"subsys/net/l2/openthread/openthread.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"1.14.0\",\n                            \"status\": \"affected\",\n                            \"lessThan\": \"4.5.0\",\n                            \"versionType\": \"semver\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","score":7.5,"severity":"HIGH"}],"references":["https://github.com/zephyrproject-rtos/zephyr/commit/acb3e514d7fab2bc9672acaba8019d2dc91b187c","https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-6j2r-xrm4-3v7f"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-19741","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-19741","identifiers":["CVE-2026-19741"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. Missing entries do not establish absence of exploitation.","generation":"2026-10-27T14:13:13.4177888+00:00","complete":true,"records":1758,"lastAttemptAt":"2026-10-27T14:13:13.4177888+00:00","lastSuccessAt":"2026-10-27T14:13:13.5949436+00:00","error":null,"lastVerifiedAt":"2026-10-27T14:13:13.5949458+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null},{"source":"cve-program","scope":"Official CVE Program baseline and cumulative hourly delta; all vendors, published and rejected records","generation":"cve-187d2b72c94ceb8c4417f1032ec3109a3a3a7b730abadb561d8cdd2a96e04d27-9dc13b3f7b54f4a1c758cc667a8847f14c07b9dc77a0702cd6d84d192294dcee","complete":true,"records":414999,"lastAttemptAt":"2026-10-27T14:09:37.4569013+00:00","lastSuccessAt":"2026-10-27T14:09:37.3877703+00:00","error":null,"lastVerifiedAt":"2026-10-27T14:09:37.4569013+00:00","snapshotPublishedAt":"2026-10-27T13:29:52+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null},{"source":"euvd","scope":"Rolling EUVD lookups of CVE aliases in current public OSV archives; 500 identifiers per refresh, rechecked after 48 hours. Not a global EUVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. No reader inventory is sent.","generation":"enrichment-43321610382942b8ad8c85917eab1546","complete":false,"records":4735,"lastAttemptAt":"2026-10-27T14:13:43.3397632+00:00","lastSuccessAt":"2026-10-24T23:18:49.862+00:00","error":"InvalidDataException","lastVerifiedAt":"2026-10-24T23:18:49.862+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":0,"expectedIdentifiers":13482},{"source":"first-epss:nuget","scope":"FIRST EPSS for explicit CVE aliases in the collected public NuGet archive. Not a global EPSS backfill.","generation":"2026-10-27T14:13:13.4177888+00:00","complete":true,"records":1093,"lastAttemptAt":"2026-10-27T14:13:13.4177888+00:00","lastSuccessAt":"2026-10-27T14:13:13.5957761+00:00","error":null,"lastVerifiedAt":"2026-10-27T14:13:13.5957765+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null},{"source":"nvd","scope":"Rolling NVD lookups of CVE aliases in current public OSV archives; 500 identifiers per refresh, rechecked after 48 hours. Not a global NVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. No reader inventory is sent.","generation":"enrichment-4f75cace235944cf962b1f2ff87d354c","complete":false,"records":13419,"lastAttemptAt":"2026-10-27T14:13:41.3007775+00:00","lastSuccessAt":"2026-10-27T14:13:41.296+00:00","error":null,"lastVerifiedAt":"2026-10-27T14:13:41.296+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":13480,"expectedIdentifiers":13482},{"source":"osv:Go","scope":"Complete OSV Go ecosystem archive, including withdrawn and malicious-package source records; statement counts are not unique CVE counts","generation":"go-3a2c3758b535f79c22104be560d4f9ec6117186481863e12c25eb3c2f0883a63","complete":true,"records":9780,"lastAttemptAt":"2026-10-27T14:13:13.2664331+00:00","lastSuccessAt":"2026-10-27T14:13:13.0026956+00:00","error":null,"lastVerifiedAt":"2026-10-27T14:13:13.2664331+00:00","snapshotPublishedAt":"2026-10-27T13:48:42+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null},{"source":"osv:NuGet","scope":"Complete OSV NuGet ecosystem archive, including GitHub Advisory Database records; NuGet version matching only","generation":"nuget-bad5d31e7f6a5e3d338e11d8789069b63620a403f927730769688b42f768e4f6","complete":true,"records":1965,"lastAttemptAt":"2026-10-27T14:09:37.6087582+00:00","lastSuccessAt":"2026-10-26T16:35:43.1460623+00:00","error":null,"lastVerifiedAt":"2026-10-27T14:09:37.6087582+00:00","snapshotPublishedAt":"2026-10-26T16:18:29+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null},{"source":"osv:crates.io","scope":"Complete OSV crates.io ecosystem archive, including withdrawn and malicious-package source records; statement counts are not unique CVE counts","generation":"crates.io-112103ad2640f03b274c0e731c3f4398f99b844297f2e68d520aeec5561d6df2","complete":true,"records":2997,"lastAttemptAt":"2026-10-27T14:13:13.3777521+00:00","lastSuccessAt":"2026-10-27T11:11:56.4872351+00:00","error":null,"lastVerifiedAt":"2026-10-27T14:13:13.3777521+00:00","snapshotPublishedAt":"2026-10-27T10:33:05+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null},{"source":"osv:npm","scope":"Complete OSV npm ecosystem archive, including withdrawn and malicious-package source records; statement counts are not unique CVE counts","generation":"npm-acba005f5a2be8a7838a7f9129a9b9702c7c598829a3f2d2603cc64a3d53b487","complete":true,"records":230815,"lastAttemptAt":"2026-10-27T14:13:01.0754572+00:00","lastSuccessAt":"2026-10-27T14:12:59.4154681+00:00","error":null,"lastVerifiedAt":"2026-10-27T14:13:01.0754572+00:00","snapshotPublishedAt":"2026-10-27T13:48:46+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null}]}