NLnet Labs Unbound, up to and including version 1.16.1 is vulnerable to a novel type of the "ghost domain names" attack. The vulnerability works by targeting an Unbound instance. Unbound is queried for a subdomain of a rogue domain name. The rogue nameserver returns delegation information for the subdomain that updates Unbound's delegation cache. This action can be repeated before expiry of the delegation information by querying Unbound for a second level subdomain which the rogue nameserver provides new delegation information. Since Unbound is a child-centric resolver, the ever-updating child delegation information can keep a rogue domain name resolvable long after revocation. From version 1.16.2 on, Unbound checks the validity of parent delegation records before using cached delegation information.
NVD Severity
Other trackers
Mailing lists
GitHub (code, issues), Aports (code, issues)


Type URI
Mailing List
Mailing List

Match rules

CPE URI Source package Min version Max version
cpe:2.3:a:nlnetlabs:unbound:*:*:*:*:*:*:*:* unbound >= None < 1.16.2

Vulnerable and fixed packages

Source package Branch Version Maintainer Status
unbound 3.16-main 1.15.0-r0 Jakub Jirutka <> possibly vulnerable
unbound 3.15-main 1.13.2-r2 Jakub Jirutka <> possibly vulnerable
unbound 3.14-main 1.13.2-r0 Jakub Jirutka <> possibly vulnerable
unbound 3.13-main 1.13.2-r0 Jakub Jirutka <> possibly vulnerable