CVE-2026-50248

In NLnet Labs Unbound 1.7.0 up to and including 1.25.1, when an auth/rpz zone has a configured primary hostname that resolves to BOGUS A/AAAA, it is still considered as a possible XFR endpoint. A malicious actor that can spoof the hostname's A/AAAA record (no valid RRSIG required) becomes the zone's XFR primary and can replaces the entire zone/the resolver's entire response policy.

References

https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-50248.txt

Affected packages

Git / github.com/nlnetlabs/unbound

Affected ranges

Type

GIT

Repo

https://github.com/nlnetlabs/unbound

Events

Introduced

50bd12d6953ef1bca9e5f87cd1ebb5e4b7688241

Fixed

c33ad1b1a21e48bfe4f140e90252a9be1b0c5745

Database specific

Show details

{
    "cpe":  "cpe:2.3:a:nlnetlabs:unbound:*:*:*:*:*:*:*:*",
    "extracted_events":  [
        {
            "introduced":  "1.7.0"
        },
        {
            "fixed":  "1.25.2"
        }
    ],
    "source":  "CPE_RANGE"
}

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-50248.json"