{"id":"CVE-2026-115863","revision":"79653324492145c1b824a97834901788","records":[{"revision":"79653324492145c1b824a97834901788","observedAt":"2026-10-23T18:48:20.63+00:00","statement":{"source":"cve-program","id":"CVE-2026-115863","aliases":[],"title":"ConnMan through 2.0 has a stack-based buffer overflow via a DHCPv6 Reply message. This occurs in get_domains in gdhcp/client.c. It copies a fixed NS_MAXDNAME (1025) bytes from a DHCPv6 DOMAIN_LIST (option 24) value into a 1026-byte stack bu…","description":"ConnMan through 2.0 has a stack-based buffer overflow via a DHCPv6 Reply message. This occurs in get_domains in gdhcp/client.c. It copies a fixed NS_MAXDNAME (1025) bytes from a DHCPv6 DOMAIN_LIST (option 24) value into a 1026-byte stack buffer dns_name regardless of the actual option length, then walks DNS labels with an unbounded \"c += jump + 1\" loop. A crafted DHCPv6 REPLY with a DOMAIN_LIST option of >= 1025 non-zero bytes makes the label walk leave the buffer and read/write '.' past its end in attacker-chosen strides. An on-link attacker can trigger this without authentication via a forged Router Advertisement (O=1) and a forged DHCPv6 REPLY matching xid/CLIENTID with a long DOMAIN_LIST. The impact is unauthenticated on-link crash of connmand (runs as root). This was introduced in bb06c47.","state":0,"publishedAt":"2026-10-23T17:35:18.517+00:00","modifiedAt":"2026-10-23T17:35:18.517+00:00","affected":[{"ecosystem":"Vendor product","name":"ConnMan","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"defaultStatus\": \"unknown\",\n                    \"product\": \"ConnMan\",\n                    \"vendor\": \"ConnMan\",\n                    \"versions\": [\n                        {\n                            \"lessThanOrEqual\": \"2.0\",\n                            \"status\": \"affected\",\n                            \"version\": \"0\",\n                            \"versionType\": \"custom\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H","score":7.6,"severity":"HIGH"}],"references":["https://lore.kernel.org/connman/179274561161.81299.4579745057858200074@pm.me/","https://git.kernel.org/pub/scm/network/connman/connman.git/tree/gdhcp/client.c","https://git.kernel.org/pub/scm/network/connman/connman.git/commit/?id=bb06c47101ca243fa5c04fb4b03fe2a12420d280"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-115863","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-115863","identifiers":["CVE-2026-115863"]},"retained":false,"historicalAffected":[]}],"coverage":[]}