Description
Unbound before 1.4.4 does not send responses for signed zones after mishandling an unspecified query, which allows remote attackers to cause a denial of service (DNSSEC outage) via a crafted query.
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 | 1.4.4-1 | — |
| Debian 13 | unbound | 1.4.4-1 | — |
| Debian 12 | unbound | 1.4.4-1 | — |
| Debian 5.0 | unbound | 1.4.6-1~lenny1 | DSA-2243-1 |
Advisories 1
- DSA-2243-1 unbound - design flaw Debian Security (DSA / DLA) · Mar 9, 2026