This page tracks the Debian fix status. The vulnerability itself is described on the main CVE page. View CVE-2026-50248 →

DEBIAN-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 s...

Original description

The description as published by the source.

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.

Source: OSV.dev (Open Source Vulnerabilities) OSV

Affected packages

Debian:12 unbound

[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]

Debian:13 unbound

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.26.1-0+deb13u1"}]}]

Debian:14 unbound

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.25.2-1"}]}]

References

advisory security-tracker.debian.org