USN-8844-1

It was discovered that c-ares incorrectly handled certain query completion callbacks. An attacker could possibly use this issue to trigger a use- after-free or double-free, resulting in a denial of service or arbitrary code execution.

References

Affected packages

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

1.34.6-1ubuntu0.1

Affected versions

1.*

1.34.5-1

1.34.6-1

Ecosystem specific

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

Database specific

cves_map

{
    "cves":  [
        {
            "id":  "CVE-2026-33630",
            "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:26.04:LTS"
}

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8844-1.json"