Description
Crafted zones can lead to increased resource usage and crafted CNAME chains can lead to cache poisoning in Recursor.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| PowerDNS | Recursor | 5.3.0 – < 5.3.5, 5.2.0 – < 5.2.8, 5.1.0 – < 5.1.10 | 5.3.5 |
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 | 5.3.5-1 | — |
| Debian 13 | pdns-recursor | 5.2.8-0+deb13u1 | DSA-6134-1 |
| Debian 12 | pdns-recursor | No fix yet | — |
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 | 5.4.8-1.1 | openSUSE-SU-2026:12532-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | pdns-recursor | 5.3.5-r0 | — |
| Alpine v3.23 | pdns-recursor | 5.3.5-r0 | — |
Advisories 3
- openSUSE-SU-2026:12532-1 pdns-recursor-5.4.8-1.1 on GA media SUSE / openSUSE Security Updates · Nov 12, 2026
- WID-SEC-2026-0355 PowerDNS Recursor: Mehrere Schwachstellen ermöglichen Denial of Service BSI CERT-Bund (WID) · Feb 15, 2026
- DSA-6134-1 pdns-recursor - security update Debian Security (DSA / DLA) · Feb 13, 2026