---
id: CVE-2026-50106
title: >-
  Possible insecure NXDOMAIN for non-existing records under a configured island
  trust anchor underneath an insecure parent.
summary: >-
  When NLnet Labs Unbound up to and including version 1.26.1 is configured with
  both a root trust anchor and an additional 'trust-anchor:' for an
  island-of-security zone whose parent is provably insecure under the root
  chain, a malicious a…
severity: medium
cvss: 6.5
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H'
cvssSource: cna
cwe:
  - CWE-807
vendor: NLnet Labs
product: Unbound
affected:
  - Unbound < 1.26.2
published: '2026-10-21'
updated: '2026-10-21'
sourceUpdated: '2026-10-21T08:57:11.040Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-50106'
references:
  - url: 'https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-50106.txt'
tags:
  - cve.org
ingestedAt: '2026-10-21T09:46:15.397Z'
---

## Overview

When NLnet Labs Unbound up to and including version 1.26.1 is configured with both a root trust anchor and an additional 'trust-anchor:' for an island-of-security zone whose parent is provably insecure under the root chain, a malicious actor who can deliver one forged NXDOMAIN response for a name inside the island, with the NSEC/SOA RRSIG 'SignerName' set to the insecure parent, tricks Unbound's validator to use the root trust anchor instead, and consecutively the insecure parent, thus causing that record to be treated as insecure and denying existence for records in the trust island.

## Affected

- `Unbound < 1.26.2`

## Remediation

This issue is fixed starting with version 1.26.2