CVE-2026-55708

Published Jul 22, 2026

Last updated a month ago

Overview

Description
In NLnet Labs Unbound 1.6.0 up to and including 1.25.1, the 'view_local_data' and 'view_local_datas' commands of 'unbound-control' create a bare local zones tree for an already configured named view when the view is configured with no local data to begin with. However, the creation through the control interface omits adding the default-protected zones (e.g., RFC 1918 reverse, AS112 zones, .onion, .localhost). Once the local zone tree exists without the defaults, every query for a default-protected name from a client mapped to that view escapes to the public DNS via the iterator instead of being answered locally, bypassing local policy expectations.
Source
sep@nlnetlabs.nl
NVD status
Analyzed
Products
unbound

Risk scores

CVSS 3.1

Type
Secondary
Base score
3.1
Impact score
2.5
Exploitability score
0.6
Vector string
CVSS:3.1/AV:L/AC:L/PR:H/UI:R/S:U/C:L/I:L/A:N
Severity
LOW

Weaknesses

sep@nlnetlabs.nl
CWE-1188

Social media

Hype score
Not currently trending

Configurations

References

Sources include official advisories and independent security research.