USN-7477-1

It was discovered that c-ares incorrectly handled re-enqueuing certain queries. A remote attacker could possibly use this issue to cause c-ares to crash, resulting in a denial of service.

References

Affected packages

Ubuntu:25.04 / c-ares

Package

Name: c-ares
Purl: pkg:deb/ubuntu/c-ares@1.34.4-2.1ubuntu0.1?arch=source&distro=plucky

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

1.34.4-2.1ubuntu0.1

Affected versions

1.*

1.33.0-1

1.34.2-1

1.34.3-1

1.34.4-1

1.34.4-2.1

Ecosystem specific

{
    "binaries": [
        {
            "binary_version": "1.34.4-2.1ubuntu0.1",
            "binary_name": "libc-ares-dev"
        },
        {
            "binary_version": "1.34.4-2.1ubuntu0.1",
            "binary_name": "libc-ares2"
        },
        {
            "binary_version": "1.34.4-2.1ubuntu0.1",
            "binary_name": "libcares2"
        }
    ],
    "availability": "No subscription required"
}

Database specific

cves_map

{
    "cves": [
        {
            "id": "CVE-2025-31498",
            "severity": [
                {
                    "type": "CVSS_V4",
                    "score": "CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N"
                },
                {
                    "type": "Ubuntu",
                    "score": "medium"
                }
            ]
        }
    ],
    "ecosystem": "Ubuntu:25.04"
}