Vulnerability · Published Feb 9, 2026 · Assigned by OX
CVE-2026-0398Crafted zones can lead to increased resource usage and crafted CNAME chains can lead to cache poisoning in Recursor
Medium 5.3
In plain English
A medium-severity resource allocation without limits in Recursor from PowerDNS. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 29% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)5.3Medium
Exploit odds (30 days)0.4%top 70.8% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
Crafted zones can lead to increased resource usage and crafted CNAME chains can lead to cache poisoning in Recursor.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.23 | pdns-recursor | 5.3.5-r0 | ALPINE-CVE-2026-0398 |
| Alpine:v3.24 | pdns-recursor | 5.3.5-r0 | ALPINE-CVE-2026-0398 |
| Debian:12 | pdns-recursor | no fix listed | DEBIAN-CVE-2026-0398 |
| Debian:13 | pdns-recursor | 5.2.8-0+deb13u1 | DSA-6134-1 |
| Debian:13 | pdns-recursor | 5.2.8-0+deb13u1 | DEBIAN-CVE-2026-0398 |
| Debian:14 | pdns-recursor | 5.3.5-1 | DEBIAN-CVE-2026-0398 |
| Ubuntu:24.04:LTS | pdns-recursor | no fix listed | UBUNTU-CVE-2026-0398 |
| Ubuntu:25.10 | pdns-recursor | no fix listed | UBUNTU-CVE-2026-0398 |
| Ubuntu:26.04:LTS | pdns-recursor | no fix listed | UBUNTU-CVE-2026-0398 |
| Ubuntu:26.10 | pdns-recursor | no fix listed | UBUNTU-CVE-2026-0398 |
Affected products (as reported)
Weakness: CWE-770 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L