Vulnerability · Published Apr 22, 2026 · Assigned by OX
CVE-2026-33600Null pointer dereference in RPZ transfer
Medium 4.4
In plain English
A medium-severity null pointer dereference 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 0.5% (higher than 45% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)4.4Medium
Exploit odds (30 days)0.5%top 55.4% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
An RPZ sent by a malicious authoritative server can result in a null pointer dereference, caused by a missing consistency check and leading to a denial of service.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.23 | pdns-recursor | 5.3.6-r0 | ALPINE-CVE-2026-33600 |
| Alpine:v3.24 | pdns-recursor | 5.4.1-r0 | ALPINE-CVE-2026-33600 |
| Debian:12 | pdns-recursor | no fix listed | DEBIAN-CVE-2026-33600 |
| Debian:13 | pdns-recursor | 5.2.9-0+deb13u1 | DEBIAN-CVE-2026-33600 |
| Debian:14 | pdns-recursor | 5.4.1-1 | DEBIAN-CVE-2026-33600 |
| Ubuntu:24.04:LTS | pdns-recursor | no fix listed | UBUNTU-CVE-2026-33600 |
| Ubuntu:25.10 | pdns-recursor | no fix listed | UBUNTU-CVE-2026-33600 |
| Ubuntu:26.04:LTS | pdns-recursor | no fix listed | UBUNTU-CVE-2026-33600 |
| Ubuntu:26.10 | pdns-recursor | no fix listed | UBUNTU-CVE-2026-33600 |
Affected products (as reported)
Weakness: CWE-476 · Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H