CVE-2026-33259

MEDIUM

Concurrent modification of RPZ data can lead to denial of servce

Title source: cna

Description

Having many concurrent transfers of the same RPZ can lead to inconsistent RPZ data, use after free and/or a crash of the recursor. Normally concurrent transfers of the same RPZ zone can only occur with a malfunctioning RPZ provider.

References (1)

https://docs.powerdns.com/recursor/security-advisories/powerdns-advisory-powerdns-2026-03.html

Scores

CVSS v3 5.0

EPSS 0.0000

EPSS Percentile 0.0%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:H

CISA SSVC

Vulnrichment

Exploitation none

Automatable no

Technical Impact partial

Details

CWE

CWE-416

Status published

Products (5)

powerdns/recursor 5.4.0

PowerDNS/Recursor 5.2.0 - 5.2.9

powerdns/recursor 5.2.0 - 5.2.9

PowerDNS/Recursor 5.3.0 - 5.3.6

PowerDNS/Recursor 5.4.0 - 5.4.1

Published Apr 22, 2026

Tracked Since Apr 22, 2026