Description
An attacker can publish a zone containing specific Resource Record Sets.
Repeatedly processing and caching results for these sets can lead to a
denial of service.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| PowerDNS | Recursor | < 4.9.9, 5.0.0 – < 5.0.9, 5.1.0 – < 5.1.2 | 4.9.9 |
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 | pdns-recursor | 5.0.9-1 | — |
| Debian 13 | pdns-recursor | 5.0.9-1 | — |
| Debian 12 | pdns-recursor | 4.8.8-1+deb12u1 | DSA-5852-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | pdns-recursor | No fix yet | — |
| Ubuntu 26.04 LTS | pdns-recursor | No fix yet | — |
| Ubuntu 25.10 | pdns-recursor | No fix yet | — |
| Ubuntu 24.04 LTS | pdns-recursor | No fix yet | — |
Show 4 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 22.04 LTS | pdns-recursor | No fix yet | — |
| Ubuntu Pro 20.04 LTS | pdns-recursor | No fix yet | — |
| Ubuntu Pro 18.04 LTS | pdns-recursor | No fix yet | — |
| Ubuntu Pro 16.04 LTS | pdns-recursor | No fix yet | — |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | pdns-recursor | 5.1.2-1.1 | openSUSE-SU-2024:14462-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | pdns-recursor | 5.1.2-r0 | — |
| Alpine v3.23 | pdns-recursor | 5.1.2-r0 | — |
| Alpine v3.22 | pdns-recursor | 5.1.2-r0 | — |
| Alpine v3.21 | pdns-recursor | 5.1.2-r0 | — |
| Alpine v3.20 | pdns-recursor | 5.0.9-r0 | — |
Advisories 3
- DSA-5852-1 pdns-recursor - security update Debian Security (DSA / DLA) · Mar 9, 2026
- openSUSE-SU-2024:14462-1 pdns-recursor-5.1.2-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- WID-SEC-2024-3062 PowerDNS: Schwachstelle ermöglicht Denial of Service BSI CERT-Bund (WID) · Jul 27, 2025