CVE-2026-33259

Concurrent modification of RPZ data can lead to denial of servce

State: Published
Severity: 5.0 Medium
Published: Apr 22, 2026
Updated: Apr 22, 2026
Reserved: Mar 18, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	5.0 Medium	CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:H	OX

Weaknesses

CWE-416 Use After Free

Affected Products

Product	Versions
RecursorPowerDNS	5.4.0 to before 5.4.1Affected 5.3.0 to before 5.3.6Affected 5.2.0 to before 5.2.9Affected

References

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

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