Home/CVE/A zone transition from NSEC to NSEC3 might trigger an internal inconsistency and cause a denial of service.
CVE

CVE-2026-33261

A zone transition from NSEC to NSEC3 might trigger an internal inconsistency and cause a denial of service.

A zone transition from NSEC to NSEC3 might trigger an internal inconsistency and cause a denial of service.

MEDIUM · CVSS 5.9 EPSS 1e-05
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  • No active-exploitation, high-EPSS, or public-exploit signals - routine patching cadence
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-353Missing Support for Integrity Check
▤

Affected Products & Versions

3
powerdns recursor>= 5.2.0 and < 5.2.9
powerdns recursor>= 5.3.0 and < 5.3.6
powerdns recursorall versions
▣

Scoring & Timeline

5.9
MEDIUM · CVSS v3.1 · security@open-xchange.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD22 Apr 2026 · 10:16 AM
CVSS VectorCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
SSVC triage · cisa-vulnrichment
Exploitation
none
Automatable
no
Technical impact
partial
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
🔗

References & Sources

1
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://docs.powerdns.com/recursor/security-advisories/powerdns-advisory-powerdns-2026-03.htmlBroken LinkVendor Advisory
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