Description
When incoming DNS over HTTPS support is enabled using the nghttp2 provider, and queries are routed to a tcp-only or DNS over TLS backend, an attacker can trigger an assertion failure in DNSdist by sending a request for a zone transfer (AXFR or IXFR) over DNS over HTTPS, causing the process to stop and thus leading to a Denial of Service. DNS over HTTPS is not enabled by default, and backends are using plain DNS (Do53) by default.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| PowerDNS | DNSdist | 1.9.0, 1.9.1, 1.9.2, 1.9.3 | — |
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 | dnsdist | 1.9.4-1 | — |
| Debian 13 | dnsdist | 1.9.4-1 | — |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | dnsdist | 1.9.4-1.1 | openSUSE-SU-2024:13958-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | dnsdist | 1.9.4-r0 | — |
| Alpine v3.23 | dnsdist | 1.9.4-r0 | — |
| Alpine v3.22 | dnsdist | 1.9.4-r0 | — |
| Alpine v3.21 | dnsdist | 1.9.4-r0 | — |
| Alpine v3.20 | dnsdist | 1.9.4-r0 | — |
Advisories 2
- openSUSE-SU-2024:13958-1 dnsdist-1.9.4-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- WID-SEC-2024-1094 PowerDNS: Schwachstelle ermöglicht Denial of Service BSI CERT-Bund (WID) · Oct 7, 2024