CVE-2026-33258
Received
Received - Intake
Cache Allocation Vulnerability in NSEC(3) Caches Causes Resource Exhaustion
Publication date: 2026-04-22
Last updated on: 2026-04-27
Assigner: Open-Xchange
Description
Description
By publishing and querying a crafted zone an attacker can cause allocation of large entries in the negative and aggressive NSEC(3) caches.
CVSS Scores
EPSS Scores
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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-770 | The product allocates a reusable resource or group of resources on behalf of an actor without imposing any intended restrictions on the size or number of resources that can be allocated. |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
This vulnerability occurs when an attacker publishes and queries a specially crafted DNS zone, which causes the system to allocate large entries in the negative and aggressive NSEC(3) caches.
How can this vulnerability impact me? :
The impact of this vulnerability is a potential denial of service due to resource exhaustion, as the allocation of large cache entries can degrade system performance or cause crashes.
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