UBUNTU-CVE-2026-69184

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Source
https://ubuntu.com/security/CVE-2026-69184
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-69184.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-69184
Upstream
Published
2026-09-18T18:17:00Z
Modified
2026-09-29T23:41:07Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

c-ares is an asynchronous resolver library. Prior to 1.34.7, ares_dns_name_parse() enforces backward DNS compression pointers but does not bound the total pointer hops or assembled name length. A malicious DNS server can send a response containing a long descending pointer chain and many resource records whose NAME or RDATA fields refer to the chain, causing repeated decompression work that grows quadratically with message size. A single crafted response can stall the single-threaded c-ares event loop and deny DNS resolution, without causing memory corruption or information disclosure. This issue is fixed in version 1.34.7.

References

Affected packages

Ubuntu:20.04:LTS
c-ares

Package

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

Affected ranges

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

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 

{
    "binaries": [
        {
            "binary_name": "libc-ares2",
            "binary_version": "1.15.0-1ubuntu0.5"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-69184.json"
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

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 

{
    "binaries": [
        {
            "binary_name": "libc-ares2",
            "binary_version": "1.18.1-1ubuntu0.22.04.3"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-69184.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

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 

{
    "binaries": [
        {
            "binary_name": "libcares2",
            "binary_version": "1.27.0-1.0ubuntu1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-69184.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

Affected versions

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

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libc-ares2",
            "binary_version": "1.34.6-1ubuntu0.1"
        },
        {
            "binary_name": "libcares2",
            "binary_version": "1.34.6-1ubuntu0.1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-69184.json"
Ubuntu:Pro:16.04:LTS
c-ares

Package

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

Affected ranges

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

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 

{
    "binaries": [
        {
            "binary_name": "libc-ares2",
            "binary_version": "1.10.0-3ubuntu0.2+esm3"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-69184.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

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 

{
    "binaries": [
        {
            "binary_name": "libc-ares2",
            "binary_version": "1.14.0-1ubuntu0.2+esm2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-69184.json"