{"id":"CVE-2026-115863","aliases":["DEBIAN-CVE-2026-115863","EUVD-2026-109113","GHSA-725f-6r9j-c4hf","UBUNTU-CVE-2026-115863"],"status":"published","title":"ConnMan through 2.0 has a stack-based buffer overflow via a DHCPv6 Reply message. This occurs in...","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 \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.","severity":{"version":"3.1","score":7.6,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.00299,"percentile":0.22914,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-121"],"published":"2026-10-23T17:35:18Z","modified":"2026-11-02T17:17:36Z","affected":[{"source":"osv","ecosystem":"Debian:12","package":"connman","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"]},{"source":"osv","ecosystem":"Debian:13","package":"connman","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"]},{"source":"osv","ecosystem":"Debian:14","package":"connman","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"]},{"source":"osv","ecosystem":"Ubuntu:Pro:16.04:LTS","package":"connman","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.21-1.2","1.21-1.2build1","1.21-1.2build2","1.21-1.2+deb8u1build0.16.04.1","1.21-1.2+deb8u1ubuntu0.1~esm1"]},{"source":"osv","ecosystem":"Ubuntu:Pro:18.04:LTS","package":"connman","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.35-1","1.35-2","1.35-6","1.35-6ubuntu0.1~esm1"]},{"source":"osv","ecosystem":"Ubuntu:20.04:LTS","package":"connman","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.36-2build1","1.36-2ubuntu0.1"]},{"source":"osv","ecosystem":"Ubuntu:22.04:LTS","package":"connman","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.36-2.2build1","1.36-2.3","1.36-2.3build1","1.36-2.3ubuntu0.1"]},{"source":"osv","ecosystem":"Ubuntu:24.04:LTS","package":"connman","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.41-3","1.42-1","1.42-3","1.42-5","1.42-5build2","1.42-5build3"]},{"source":"osv","ecosystem":"Ubuntu:26.10","package":"connman","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.45-3","2.0-2"]},{"source":"osv","ecosystem":"Ubuntu:26.04:LTS","package":"connman","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.44-3","1.45-2","1.45-3"]}],"products":[{"vendor":"connman","product":"connman"}],"references":[{"url":"https://lore.kernel.org/connman/179274561161.81299.4579745057858200074@pm.me/","tags":["third-party-advisory","report"]},{"url":"https://git.kernel.org/pub/scm/network/connman/connman.git/tree/gdhcp/client.c","tags":["product","report"]},{"url":"https://git.kernel.org/pub/scm/network/connman/connman.git/commit/?id=bb06c47101ca243fa5c04fb4b03fe2a12420d280","tags":["product","report"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-115863"},{"url":"https://lore.kernel.org/connman/179274561161.81299.4579745057858200074@pm.me"},{"url":"https://github.com/advisories/GHSA-725f-6r9j-c4hf"},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-115863","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2026-115863","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-115863","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2026-115863","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 \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.","status":"published","published":"2026-10-23T17:35:18.517Z","modified":"2026-11-02T16:52:00.3Z","cvss":[{"version":"3.1","score":7.6,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H","level":"high","assessor":"cna"}],"cwes":["CWE-121"],"updated_at":"2026-11-02T18:00:08.034842Z"}],"euvd":[{"id":"EUVD-2026-109113","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 \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.","status":"published","published":"2026-10-23T17:35:18Z","modified":"2026-11-02T16:52:00Z","cvss":[{"version":"3.1","score":7.6,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H","level":"high"}],"updated_at":"2026-11-03T05:08:40.251173Z"}],"ghsa":[{"id":"GHSA-725f-6r9j-c4hf","title":"ConnMan through 2.0 has a stack-based buffer overflow via a DHCPv6 Reply message. This occurs in...","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 \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.","status":"published","published":"2026-10-23T18:31:39Z","modified":"2026-10-23T18:31:45Z","cvss":[{"version":"3.1","score":7.6,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H","level":"high"}],"cwes":["CWE-121"],"updated_at":"2026-11-02T15:14:20.113334Z"}],"nvd":[{"id":"CVE-2026-115863","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 \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.","status":"published","published":"2026-10-23T18:17:21.757Z","modified":"2026-11-02T17:17:36.563Z","cvss":[{"version":"3.1","score":7.6,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H","level":"high","assessor":"secondary"}],"cwes":["CWE-121"],"updated_at":"2026-11-02T20:51:42.579129Z"}],"osv":[{"id":"DEBIAN-CVE-2026-115863","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 \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.","status":"published","published":"2026-10-23T18:17:21.757Z","modified":"2026-11-03T09:47:28.303504155Z","cvss":[{"version":"3.1","score":7.6,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H","level":"high"}],"updated_at":"2026-11-03T10:27:58.933618Z"},{"id":"UBUNTU-CVE-2026-115863","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 \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.","status":"published","published":"2026-10-23T18:17:00Z","modified":"2026-10-28T17:50:38Z","cvss":[{"version":"3.1","score":7.6,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H","level":"high"}],"updated_at":"2026-11-02T16:56:00.081948Z"}]}}