CVE-2026-33258
Crafted zones can cause increased resource usage
Description
By publishing and querying a crafted zone an attacker can cause allocation of large entries in the negative and aggressive NSEC(3) caches.
INFO
Published Date :
April 22, 2026, 10:16 a.m.
Last Modified :
April 27, 2026, 5:03 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | MEDIUM | 8ce71d90-2354-404b-a86e-bec2cc4e6981 | ||||
| CVSS 3.1 | MEDIUM | [email protected] | ||||
| CVSS 3.1 | HIGH | [email protected] |
Solution
- Validate zone data integrity.
- Limit aggressive NSEC(3) cache size.
- Apply relevant DNS software updates.
- Monitor DNS cache performance.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-33258.
| URL | Resource |
|---|---|
| https://docs.powerdns.com/recursor/security-advisories/powerdns-advisory-powerdns-2026-03.html | Vendor Advisory Broken Link |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-33258 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-33258
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-33258 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-33258 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Apr. 27, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Added CPE Configuration OR *cpe:2.3:a:powerdns:recursor:*:*:*:*:*:*:*:* versions from (including) 5.2.0 up to (excluding) 5.2.9 *cpe:2.3:a:powerdns:recursor:*:*:*:*:*:*:*:* versions from (including) 5.3.0 up to (excluding) 5.3.6 *cpe:2.3:a:powerdns:recursor:5.4.0:*:*:*:*:*:*:* Added Reference Type Open-Xchange: https://docs.powerdns.com/recursor/security-advisories/powerdns-advisory-powerdns-2026-03.html Types: Broken Link, Vendor Advisory -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Apr. 22, 2026
Action Type Old Value New Value Added CWE CWE-770 -
New CVE Received by [email protected]
Apr. 22, 2026
Action Type Old Value New Value Added Description By publishing and querying a crafted zone an attacker can cause allocation of large entries in the negative and aggressive NSEC(3) caches. Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L Added Reference https://docs.powerdns.com/recursor/security-advisories/powerdns-advisory-powerdns-2026-03.html