UBUNTU-CVE-2026-33630

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Source

https://ubuntu.com/security/CVE-2026-33630

Import Source

https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-33630.json

JSON Data

https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-33630

Upstream

CVE-2026-33630

Published

2026-09-03T19:17:00Z

Modified

2026-09-16T14:01:55Z

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. From ver 1.32.3 until 1.34.7, a use-after-free / double-free in c-ares' query-completion handling. The same flaw — a query's callback being invoked while the query is still linked in the channel's internal lookup structures — is present at multiple points in the resend/finish path (timeout handling, response handling, and query dispatch). If the query, or for ares_getaddrinfo() the owning host_query, is freed as a side effect of that callback, it is then accessed and/or freed a second time. This vulnerability is fixed in ver 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-2026-33630.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-2026-33630.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-2026-33630.json"

Ubuntu:25.10

c-ares

Package

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

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Affected versions

1.*

1.34.4-2.1

1.34.5-1

1.34.5-1ubuntu0.1

Ecosystem specific

{
    "binaries": [
        {
            "binary_name": "libc-ares2",
            "binary_version": "1.34.5-1ubuntu0.1"
        },
        {
            "binary_name": "libcares2",
            "binary_version": "1.34.5-1ubuntu0.1"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-33630.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

Ecosystem specific

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

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-33630.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-2026-33630.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-2026-33630.json"