CVE-2026-50106
MEDIUM
6,5
Source: [email protected]
Attack Vector: network
Attack Complexity: high
Privileges Required: none
User Interaction: none
Scope: unchanged
Confidentiality: none
Integrity: low
Availability: high
Description
AI Translation Available
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.
807
Reliance on Untrusted Inputs in a Security Decision
IncompleteCommon Consequences
Security Scopes Affected:
Confidentiality
Access Control
Availability
Other
Potential Impacts:
Bypass Protection Mechanism
Gain Privileges Or Assume Identity
Varies By Context
Applicable Platforms
Technologies:
Not Technology-Specific, Web Based, Web Server
https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-50106.txt