USN-8951-1

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Source
https://ubuntu.com/security/notices/USN-8951-1
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8951-1.json
JSON Data
https://api.test.osv.dev/v1/vulns/USN-8951-1
Upstream
CVE (4)
Related
UBUNTU (4)
Published
2026-10-21T18:20:42Z
Modified
2026-10-22T04:43:03Z
Summary
c-ares vulnerabilities
Details

It was discovered that c-ares incorrectly parsed certain SOA replies. A remote attacker could possibly use this issue to cause c-ares to crash, resulting in a denial of service. This issue only affected Ubuntu 16.04 LTS and Ubuntu 18.04 LTS. (CVE-2020-22217)

It was discovered that c-ares incorrectly handled certain sortlist strings. A remote attacker could possibly use this issue to cause c-ares to crash, resulting in a denial of service, or execute arbitrary code. This issue only affected Ubuntu 16.04 LTS. (CVE-2022-4904)

It was discovered that c-ares did not properly limit DNS compression pointer hops or assembled name lengths when parsing DNS names. A remote attacker could possibly use this issue to cause c-ares to use excessive resources, resulting in a denial of service. (CVE-2026-69184)

It was discovered that c-ares did not properly validate record count fields before allocating memory when parsing DNS responses. A remote attacker could possibly use this issue to cause c-ares to use excessive resources, resulting in a denial of service. This issue only affected Ubuntu 24.04 LTS and Ubuntu 26.04 LTS. (CVE-2026-69186)

References

Affected packages

Ubuntu:22.04:LTS
c-ares

Package

Name
c-ares
Purl
pkg:deb/ubuntu/c-ares?arch=source&distro=jammy

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
1.18.1-1ubuntu0.22.04.4

Affected versions

1.*
1.17.1-1ubuntu1
1.18.1-1
1.18.1-1build1
1.18.1-1ubuntu0.22.04.1
1.18.1-1ubuntu0.22.04.2
1.18.1-1ubuntu0.22.04.3

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "libc-ares2",
            "binary_version": "1.18.1-1ubuntu0.22.04.4"
        }
    ]
}

Database specific

cves_map 
{
    "cves": [
        {
            "id": "CVE-2026-69184",
            "severity": [
                {
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                    "type": "CVSS_V3"
                },
                {
                    "score": "medium",
                    "type": "Ubuntu"
                }
            ]
        }
    ],
    "ecosystem": "Ubuntu:22.04:LTS"
}
source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8951-1.json"
Ubuntu:24.04:LTS
c-ares

Package

Name
c-ares
Purl
pkg:deb/ubuntu/c-ares?arch=source&distro=noble

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
1.27.0-1.0ubuntu1.1

Affected versions

1.*
1.19.1-3
1.20.1-1
1.26.0-1
1.27.0-1
1.27.0-1.0ubuntu1

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "libcares2",
            "binary_version": "1.27.0-1.0ubuntu1.1"
        }
    ]
}

Database specific

cves_map 
{
    "cves": [
        {
            "id": "CVE-2026-69184",
            "severity": [
                {
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                    "type": "CVSS_V3"
                },
                {
                    "score": "medium",
                    "type": "Ubuntu"
                }
            ]
        },
        {
            "id": "CVE-2026-69186",
            "severity": [
                {
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
                    "type": "CVSS_V3"
                },
                {
                    "score": "medium",
                    "type": "Ubuntu"
                }
            ]
        }
    ],
    "ecosystem": "Ubuntu:24.04:LTS"
}
source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8951-1.json"
Ubuntu:26.04:LTS
c-ares

Package

Name
c-ares
Purl
pkg:deb/ubuntu/c-ares?arch=source&distro=resolute

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
1.34.6-1ubuntu0.2

Affected versions

1.*
1.34.5-1
1.34.6-1
1.34.6-1ubuntu0.1

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "libc-ares2",
            "binary_version": "1.34.6-1ubuntu0.2"
        },
        {
            "binary_name": "libcares2",
            "binary_version": "1.34.6-1ubuntu0.2"
        }
    ]
}

Database specific

cves_map 
{
    "cves": [
        {
            "id": "CVE-2026-69184",
            "severity": [
                {
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                    "type": "CVSS_V3"
                },
                {
                    "score": "medium",
                    "type": "Ubuntu"
                }
            ]
        },
        {
            "id": "CVE-2026-69186",
            "severity": [
                {
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
                    "type": "CVSS_V3"
                },
                {
                    "score": "medium",
                    "type": "Ubuntu"
                }
            ]
        }
    ],
    "ecosystem": "Ubuntu:26.04:LTS"
}
source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8951-1.json"
Ubuntu:Pro:16.04:LTS
c-ares

Package

Name
c-ares
Purl
pkg:deb/ubuntu/c-ares?arch=source&distro=esm-infra-legacy%2Fxenial

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
1.10.0-3ubuntu0.2+esm4

Affected versions

1.*
1.10.0-2
1.10.0-3
1.10.0-3ubuntu0.1
1.10.0-3ubuntu0.2
1.10.0-3ubuntu0.2+esm1
1.10.0-3ubuntu0.2+esm2
1.10.0-3ubuntu0.2+esm3

Ecosystem specific 

{
    "availability": "Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro",
    "binaries": [
        {
            "binary_name": "libc-ares2",
            "binary_version": "1.10.0-3ubuntu0.2+esm4"
        }
    ]
}

Database specific

cves_map 
{
    "cves": [
        {
            "id": "CVE-2020-22217",
            "severity": [
                {
                    "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
                    "type": "CVSS_V3"
                },
                {
                    "score": "medium",
                    "type": "Ubuntu"
                }
            ]
        },
        {
            "id": "CVE-2022-4904",
            "severity": [
                {
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H",
                    "type": "CVSS_V3"
                },
                {
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H",
                    "type": "CVSS_V3"
                },
                {
                    "score": "medium",
                    "type": "Ubuntu"
                }
            ]
        },
        {
            "id": "CVE-2026-69184",
            "severity": [
                {
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                    "type": "CVSS_V3"
                },
                {
                    "score": "medium",
                    "type": "Ubuntu"
                }
            ]
        }
    ],
    "ecosystem": "Ubuntu:Pro:16.04:LTS"
}
source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8951-1.json"
Ubuntu:Pro:18.04:LTS
c-ares

Package

Name
c-ares
Purl
pkg:deb/ubuntu/c-ares?arch=source&distro=esm-infra%2Fbionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
1.14.0-1ubuntu0.2+esm3

Affected versions

1.*
1.13.0-2
1.13.0-3
1.14.0-1
1.14.0-1ubuntu0.1
1.14.0-1ubuntu0.2
1.14.0-1ubuntu0.2+esm1
1.14.0-1ubuntu0.2+esm2

Ecosystem specific 

{
    "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
    "binaries": [
        {
            "binary_name": "libc-ares2",
            "binary_version": "1.14.0-1ubuntu0.2+esm3"
        }
    ]
}

Database specific

cves_map 
{
    "cves": [
        {
            "id": "CVE-2020-22217",
            "severity": [
                {
                    "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
                    "type": "CVSS_V3"
                },
                {
                    "score": "medium",
                    "type": "Ubuntu"
                }
            ]
        },
        {
            "id": "CVE-2026-69184",
            "severity": [
                {
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                    "type": "CVSS_V3"
                },
                {
                    "score": "medium",
                    "type": "Ubuntu"
                }
            ]
        }
    ],
    "ecosystem": "Ubuntu:Pro:18.04:LTS"
}
source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8951-1.json"
Ubuntu:Pro:20.04:LTS
c-ares

Package

Name
c-ares
Purl
pkg:deb/ubuntu/c-ares?arch=source&distro=esm-infra%2Ffocal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
1.15.0-1ubuntu0.5+esm1

Affected versions

1.*
1.15.0-1build1
1.15.0-1ubuntu0.1
1.15.0-1ubuntu0.2
1.15.0-1ubuntu0.3
1.15.0-1ubuntu0.4
1.15.0-1ubuntu0.5

Ecosystem specific 

{
    "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
    "binaries": [
        {
            "binary_name": "libc-ares2",
            "binary_version": "1.15.0-1ubuntu0.5+esm1"
        }
    ]
}

Database specific

cves_map 
{
    "cves": [
        {
            "id": "CVE-2026-69184",
            "severity": [
                {
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                    "type": "CVSS_V3"
                },
                {
                    "score": "medium",
                    "type": "Ubuntu"
                }
            ]
        }
    ],
    "ecosystem": "Ubuntu:Pro:20.04:LTS"
}
source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8951-1.json"