CVE-2026-33259
Received
Received - Intake
Use-After-Free in RPZ Transfers Causes Recursor Crash
Vulnerability report for CVE-2026-33259, including description, CVSS score, EPSS score, affected products, exploitability, helpful resources, and attack-flow context.
Publication date: 2026-04-22
Last updated on: 2026-04-27
Assigner: Open-Xchange
Description
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.
CVSS Scores
EPSS Scores
| Probability: | |
| Percentile: |
Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| powerdns | recursor | From 5.2.0 (inc) to 5.2.9 (exc) |
| powerdns | recursor | From 5.3.0 (inc) to 5.3.6 (exc) |
| powerdns | recursor | 5.4.0 |
Helpful Resources
Exploitability
CWE
KEV
| CWE ID | Description |
|---|---|
| CWE-416 | The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer. |
