connman — security advisory
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.
- Products
- connman
- Affected 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
- Fixed versions
- Not specified
- CVEs
- CVE-2026-115863
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 08:58 UTC · Revision 1
Source evidence
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.
osv:DEBIAN-CVE-2026-115863
connman
Fixed versions: Not specified
connman
Fixed versions: Not specified
connman
Fixed versions: Not specified
Complete source record
{
"id": "a8116048a496688d0b18a9ae7cf8aaffeac6229cea99d75edfb7a241c62d4121",
"url": "https://osv.dev/vulnerability/DEBIAN-CVE-2026-115863",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "DEBIAN-CVE-2026-115863",
"summary": "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.",
"evidence": "osv:DEBIAN-CVE-2026-115863",
"products": [
{
"name": {
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"evidence": "/affected/0/package/name"
},
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"fixed_versions": [],
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{
"value": "1.41-3",
"evidence": "/affected/0/versions"
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{
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{
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{
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"evidence": "/affected/0/versions"
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{
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{
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{
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{
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{
"value": "1.44-2",
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{
"value": "1.44-3",
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{
"value": "1.45-1",
"evidence": "/affected/0/versions"
},
{
"value": "1.45-2",
"evidence": "/affected/0/versions"
},
{
"value": "1.45-3",
"evidence": "/affected/0/versions"
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{
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{
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{
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{
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"evidence": "/affected/1/versions"
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{
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"evidence": "/affected/1/versions"
},
{
"value": "1.45-2",
"evidence": "/affected/1/versions"
},
{
"value": "1.45-3",
"evidence": "/affected/1/versions"
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{
"value": "2.0-1",
"evidence": "/affected/1/versions"
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{
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{
"name": {
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"evidence": "/affected/2/package/name"
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{
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{
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"evidence": "/affected/2/versions"
},
{
"value": "1.45-2",
"evidence": "/affected/2/versions"
},
{
"value": "1.45-3",
"evidence": "/affected/2/versions"
},
{
"value": "2.0-1",
"evidence": "/affected/2/versions"
},
{
"value": "2.0-2",
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}
]
}
],
"severity": "high",
"structured": {
"id": "DEBIAN-CVE-2026-115863",
"aliases": [
"DEBIAN-CVE-2026-115863"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "connman",
"purl": "pkg:deb/debian/connman?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"versions": [
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"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",
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"2.0-2"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-115863.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "connman",
"purl": "pkg:deb/debian/connman?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"versions": [
"1.44-3",
"1.45-1",
"1.45-2",
"1.45-3",
"2.0-1",
"2.0-2"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-115863.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "connman",
"purl": "pkg:deb/debian/connman?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"versions": [
"1.44-3",
"1.45-1",
"1.45-2",
"1.45-3",
"2.0-1",
"2.0-2"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-115863.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
],
"modified": "2026-10-24T13:00:06.703793506Z",
"provider": "osv",
"upstream": [
"CVE-2026-115863"
],
"references": [
"https://security-tracker.debian.org/tracker/CVE-2026-115863"
]
},
"related_cves": [
{
"value": "CVE-2026-115863",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 442650,
"published_at": "2026-10-23T18:17:21.757+00:00"
}