CVE-2026-33259
Medium
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.
SeverityMedium
CVSS5.0
Exploit probability—
ProductPowerdns Recursor
PublishedApr 22, 2026
First seenApr 22, 2026
Weakness typeCWE-416Use after free
How to fix
Update
- powerdns recursor5.2.9, 5.3.6 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| powerdns recursor | 5.2.0 ≤ v < 5.2.9, 5.3.0 ≤ v < 5.3.6, 5.4.0 | 5.2.9, 5.3.6 |
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