Vulnerability · Published Jun 25, 2026 · Assigned by OX
CVE-2026-42390ZONEMD validation can be bypassed
Medium 5.3
In plain English
A medium-severity improper input validation 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 0.3% (higher than 23% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)5.3Medium
Exploit odds (30 days)0.3%top 77.3% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
An invalid zone might pass ZONEMD validation while it should not. This is only relevant if ZoneToCache is configured with ZONEMD validation.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.24 | pdns-recursor | 5.4.3-r0 | ALPINE-CVE-2026-42390 |
| Debian:12 | pdns-recursor | no fix listed | DEBIAN-CVE-2026-42390 |
| Debian:13 | pdns-recursor | 5.2.11-0+deb13u1 | DEBIAN-CVE-2026-42390 |
| Debian:14 | pdns-recursor | 5.4.3-1 | DEBIAN-CVE-2026-42390 |
| Ubuntu:24.04:LTS | pdns-recursor | no fix listed | UBUNTU-CVE-2026-42390 |
| Ubuntu:25.10 | pdns-recursor | no fix listed | UBUNTU-CVE-2026-42390 |
| Ubuntu:26.04:LTS | pdns-recursor | no fix listed | UBUNTU-CVE-2026-42390 |
| Ubuntu:26.10 | pdns-recursor | no fix listed | UBUNTU-CVE-2026-42390 |
Affected products (as reported)
Weakness: CWE-20 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N