UBUNTU-CVE-2025-62408

c-ares is an asynchronous resolver library. Versions 1.32.3 through 1.34.5 terminate a query after maximum attempts when using readanswer() and processanswer(), which can cause a Denial of Service. This issue is fixed in version 1.34.6.

References

Affected packages

Ubuntu:25.10 / c-ares

Package

Name: c-ares
Purl: pkg:deb/ubuntu/c-ares@1.34.5-1ubuntu0.1?arch=source&distro=questing

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

1.34.5-1ubuntu0.1

Affected versions

1.*

1.34.4-2.1

1.34.5-1

Ecosystem specific

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "libc-ares-dev",
            "binary_version": "1.34.5-1ubuntu0.1"
        },
        {
            "binary_name": "libc-ares2",
            "binary_version": "1.34.5-1ubuntu0.1"
        },
        {
            "binary_name": "libcares2",
            "binary_version": "1.34.5-1ubuntu0.1"
        }
    ]
}

Ubuntu:25.04 / c-ares

Package

Name: c-ares
Purl: pkg:deb/ubuntu/c-ares@1.34.4-2.1ubuntu0.2?arch=source&distro=plucky

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

1.34.4-2.1ubuntu0.2

Affected versions

1.*

1.33.0-1

1.34.2-1

1.34.3-1

1.34.4-1

1.34.4-2.1

1.34.4-2.1ubuntu0.1

Ecosystem specific

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "libc-ares-dev",
            "binary_version": "1.34.4-2.1ubuntu0.2"
        },
        {
            "binary_name": "libc-ares2",
            "binary_version": "1.34.4-2.1ubuntu0.2"
        },
        {
            "binary_name": "libcares2",
            "binary_version": "1.34.4-2.1ubuntu0.2"
        }
    ]
}