{"schema":"threatline.record/2","record":{"id":"CVE-2026-49868","aliases":["GHSA-p3fx-9qcg-jmcf"],"summary":"RIOT: DHCPv6 client _parse_reply() missing sub-option length check leads to size_t underflow and unbounded OOB heap read","details":"RIOT is an open-source microcontroller operating system designed for Internet of Things devices and other embedded systems. Prior to 2026.07, _parse_reply() in sys/net/application_layer/dhcpv6/client.c omits minimum-length validation before passing IA_PD and IA_NA option bodies to sub-option parsers. A malicious or compromised DHCPv6 server can send a REPLY with an option length smaller than the required structure while MODULE_DHCPV6_CLIENT_IA_PD is enabled, causing _parse_ia_pd_option to read past the option body, size_t underflow, and unbounded out-of-bounds heap reads that can crash the device and may expose or corrupt memory. This issue is fixed in version 2026.07.","categories":["Unclassified"],"product":"RIOT","vendor":"RIOT-OS","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-49868","source_modified_at":"2026-10-21T02:29:33.220Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"RIOT","vendor":"RIOT-OS","versions":[{"status":"affected","version":"< 2026.07"}],"defaultStatus":null},{"source":"GitHub Advisory Database","source_url":"https://github.com/RIOT-OS/RIOT/security/advisories/GHSA-p3fx-9qcg-jmcf","source_modified_at":"2026-07-16T10:44:20Z","fetched_at":"2026-10-24T10:48:42.330819Z","package":{"ecosystem":"riot","name":"RIOT"},"range":"<= 2026.04"}],"fixed_versions":[],"cvss":9.8,"severity":"Critical","kev":{"listed":false},"epss":{"probability":0.00371,"percentile":0.29875,"score_date":"2026-10-23"},"published_at":"2026-10-16T16:50:58.750Z","modified_at":"2026-10-21T02:29:33.220Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-49868","fetched_at":"2026-10-23T18:45:31.882637Z","source_modified_at":"2026-10-21T02:29:33.220Z"},{"source":"GitHub Advisory Database","url":"https://github.com/RIOT-OS/RIOT/security/advisories/GHSA-p3fx-9qcg-jmcf","fetched_at":"2026-10-24T10:48:42.330819Z","source_modified_at":"2026-07-16T10:44:20Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-49868","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","GitHub Advisory Database","EPSS"],"references":[{"source":"CVE List","url":"https://github.com/RIOT-OS/RIOT/security/advisories/GHSA-p3fx-9qcg-jmcf","tags":["x_refsource_CONFIRM"]},{"source":"CVE List","url":"https://github.com/RIOT-OS/RIOT/pull/22322","tags":["x_refsource_MISC"]},{"source":"CVE List","url":"https://github.com/RIOT-OS/RIOT/commit/c9830dc5f2a9bf97418de4fc7d7167d00a45df17","tags":["x_refsource_MISC"]},{"source":"CVE List","url":"https://github.com/RIOT-OS/RIOT/releases/tag/2026.07","tags":["x_refsource_MISC"]}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CVE List","ssvc":{"exploitation":"none","automatable":"no","technical_impact":"total","assessed_at":"2026-10-21T02:29:15.518787Z"},"classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":null,"confidence":"unknown","reviewed":false},"change_timestamp":"2026-10-21T02:29:33.220Z","content_hash":"8c7688b849c885541f5d236dab02b5a5e0696620b30f9fa922b4f19e4826a7ab"}}