CVE-2026-33259
Concurrent modification of RPZ data can lead to denial of servce
CVSS Score
5.0
EPSS Score
0.0%
EPSS Percentile
0th
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.
| Vendor | powerdns |
| Product | recursor |
| Published | Apr 22, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:H Attack Vector
Network
Attack Complexity
High
Privileges Required
High
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
High
Affected Versions
PowerDNS / Recursor
5.4.0 < 5.4.1 5.3.0 < 5.3.6 5.2.0 < 5.2.9
References
Credits
Haruto Kimura (Stella)