Description
A flaw was found in the way unbound before 1.6.8 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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| NLnet Labs | unbound | before 1.6.8 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | unbound | 1.7.1-1 | — |
| Debian 13 | unbound | 1.7.1-1 | — |
| Debian 12 | unbound | 1.7.1-1 | — |
| Debian 8 | unbound | 1.4.22-3+deb8u4 | DLA-1676-1 |
| Debian 7 | unbound | 1.4.17-3+deb7u3 | DLA-1264-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 18.04 LTS | unbound | 1.6.7-1ubuntu2.1 | USN-3673-1 |
| Ubuntu 16.04 LTS | unbound | 1.5.8-1ubuntu1.1 | USN-3673-1 |
| Ubuntu 14.04 LTS | unbound | 1.4.22-1ubuntu4.14.04.3 | USN-3673-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | unbound | 1.13.2-1.2 | openSUSE-SU-2024:11005-1 |
Advisories 4
- USN-3673-1 unbound vulnerability Ubuntu Security Notices (USN) · Apr 22, 2026
- DLA-1676-1 unbound - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-1264-1 unbound - security update Debian Security (DSA / DLA) · Mar 9, 2026
- openSUSE-SU-2024:11005-1 libunbound8-1.13.2-1.2 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
References
- 102817 vdb-entry
- [debian-lts-announce] 20190214 [SECURITY] [DLA 1676-1] unbound security update mailing-list
- [debian-lts-announce] 20180130 [SECURITY] [DLA 1264-1] unbound security update mailing-list
- https://unbound.net/downloads/CVE-2017-15105.txt
- USN-3673-1 vendor-advisory