UBUNTU-CVE-2026-115863

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Source
https://ubuntu.com/security/CVE-2026-115863
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-115863.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-115863
Upstream
  • CVE-2026-115863
Published
2026-10-26T00:00:00Z
Modified
2026-10-27T04:16:44Z
Severity
  • 7.6 (High) CVSS_V3 - CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H CVSS Calculator
  • Ubuntu - medium
Summary
[none]
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 >= 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.

References

Affected packages

Ubuntu:20.04:LTS
connman

Package

Name
connman
Purl
pkg:deb/ubuntu/connman?arch=source&distro=focal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

1.*
1.36-2build1
1.36-2ubuntu0.1

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "connman",
            "binary_version":  "1.36-2ubuntu0.1"
        },
        {
            "binary_name":  "connman-vpn",
            "binary_version":  "1.36-2ubuntu0.1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-115863.json"
Ubuntu:22.04:LTS
connman

Package

Name
connman
Purl
pkg:deb/ubuntu/connman?arch=source&distro=jammy

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

1.*
1.36-2.2build1
1.36-2.3
1.36-2.3build1
1.36-2.3ubuntu0.1

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "connman",
            "binary_version":  "1.36-2.3ubuntu0.1"
        },
        {
            "binary_name":  "connman-vpn",
            "binary_version":  "1.36-2.3ubuntu0.1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-115863.json"
Ubuntu:24.04:LTS
connman

Package

Name
connman
Purl
pkg:deb/ubuntu/connman?arch=source&distro=noble

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

1.*
1.41-3
1.42-1
1.42-3
1.42-5
1.42-5build2
1.42-5build3

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "connman",
            "binary_version":  "1.42-5build3"
        },
        {
            "binary_name":  "connman-tests",
            "binary_version":  "1.42-5build3"
        },
        {
            "binary_name":  "connman-vpn",
            "binary_version":  "1.42-5build3"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-115863.json"
Ubuntu:26.04:LTS
connman

Package

Name
connman
Purl
pkg:deb/ubuntu/connman?arch=source&distro=resolute

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

1.*
1.44-3
1.45-2
1.45-3

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "connman",
            "binary_version":  "1.45-3"
        },
        {
            "binary_name":  "connman-tests",
            "binary_version":  "1.45-3"
        },
        {
            "binary_name":  "connman-vpn",
            "binary_version":  "1.45-3"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-115863.json"
Ubuntu:26.10
connman

Package

Name
connman
Purl
pkg:deb/ubuntu/connman?arch=source&distro=stonking

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

1.*
1.45-3
2.*
2.0-2

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "connman",
            "binary_version":  "2.0-2"
        },
        {
            "binary_name":  "connman-tests",
            "binary_version":  "2.0-2"
        },
        {
            "binary_name":  "connman-vpn",
            "binary_version":  "2.0-2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-115863.json"
Ubuntu:Pro:16.04:LTS
connman

Package

Name
connman
Purl
pkg:deb/ubuntu/connman?arch=source&distro=esm-apps%2Fxenial

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

1.*
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

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "connman",
            "binary_version":  "1.21-1.2+deb8u1ubuntu0.1~esm1"
        },
        {
            "binary_name":  "connman-vpn",
            "binary_version":  "1.21-1.2+deb8u1ubuntu0.1~esm1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-115863.json"
Ubuntu:Pro:18.04:LTS
connman

Package

Name
connman
Purl
pkg:deb/ubuntu/connman?arch=source&distro=esm-apps%2Fbionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

1.*
1.35-1
1.35-2
1.35-6
1.35-6ubuntu0.1~esm1

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "connman",
            "binary_version":  "1.35-6ubuntu0.1~esm1"
        },
        {
            "binary_name":  "connman-vpn",
            "binary_version":  "1.35-6ubuntu0.1~esm1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-115863.json"