Debian Security Advisory

DLA-1676-1 unbound -- LTS security update

Date Reported:
14 Feb 2019
Affected Packages:
Security database references:
In the Debian bugtracking system: Bug 887733.
In Mitre's CVE dictionary: CVE-2017-15105.
More information:

Ralph Dolmans and Karst Koymans found a flaw in the way unbound, a validating, recursive, caching DNS resolver, validated wildcard-synthesized NSEC records.

An improperly validated wildcard NSEC record could be used to prove the non-existence (NXDOMAIN answer) of an existing wildcard record, or trick unbound into accepting a NODATA proof.

For more information please refer to the upstream advisory at

For Debian 8 Jessie, this problem has been fixed in version 1.4.22-3+deb8u4.

We recommend that you upgrade your unbound packages.

Further information about Debian LTS security advisories, how to apply these updates to your system and frequently asked questions can be found at: