{"id":"CVE-2026-49868","revision":"897bdbc3c1e2421f9dd8312cc408d9a2","records":[{"revision":"897bdbc3c1e2421f9dd8312cc408d9a2","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-49868","aliases":[],"title":"RIOT: DHCPv6 client _parse_reply() missing sub-option length check leads to size_t underflow and unbounded OOB heap read","description":"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.","state":0,"publishedAt":"2026-10-16T16:50:58.75+00:00","modifiedAt":"2026-10-21T02:29:33.22+00:00","affected":[{"ecosystem":"Vendor product","name":"RIOT","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"RIOT-OS\",\n                    \"product\": \"RIOT\",\n                    \"versions\": [\n                        {\n                            \"version\": \"< 2026.07\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","score":9.8,"severity":"CRITICAL"}],"references":["https://github.com/RIOT-OS/RIOT/security/advisories/GHSA-p3fx-9qcg-jmcf","https://github.com/RIOT-OS/RIOT/pull/22322","https://github.com/RIOT-OS/RIOT/commit/c9830dc5f2a9bf97418de4fc7d7167d00a45df17","https://github.com/RIOT-OS/RIOT/releases/tag/2026.07"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-49868","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-49868","identifiers":["CVE-2026-49868"]},"retained":false,"historicalAffected":[]}],"coverage":[]}