{"id":"DEBIAN-CVE-2026-115863","details":"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 \u003e= 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.","modified":"2026-10-24T13:00:06.703793506Z","published":"2026-10-23T18:17:21.757Z","upstream":["CVE-2026-115863"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-115863"}],"affected":[{"package":{"name":"connman","ecosystem":"Debian:12","purl":"pkg:deb/debian/connman?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.41-3","1.42-1","1.42-2","1.42-3","1.42-4","1.42-5","1.43-1","1.44-1","1.44-2","1.44-3","1.45-1","1.45-2","1.45-3","2.0-1","2.0-2"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-115863.json"}},{"package":{"name":"connman","ecosystem":"Debian:13","purl":"pkg:deb/debian/connman?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.44-3","1.45-1","1.45-2","1.45-3","2.0-1","2.0-2"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-115863.json"}},{"package":{"name":"connman","ecosystem":"Debian:14","purl":"pkg:deb/debian/connman?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.44-3","1.45-1","1.45-2","1.45-3","2.0-1","2.0-2"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-115863.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H"}]}