CVE-2026-33261
Received Received - Intake
Denial of Service via NSEC to NSEC3 Zone Transition in DNS

Publication date: 2026-04-22

Last updated on: 2026-04-27

Assigner: Open-Xchange

Description
A zone transition from NSEC to NSEC3 might trigger an internal inconsistency and cause a denial of service.
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Meta Information
Published
2026-04-22
Last Modified
2026-04-27
Generated
2026-06-16
AI Q&A
2026-04-22
EPSS Evaluated
2026-06-14
NVD
CVE-2026-33261
EUVD
EUVD-2026-24727
Affected Vendors & Products
Showing 3 associated CPEs
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
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KEV
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CWE ID Description
CWE-353 The product uses a transmission protocol that does not include a mechanism for verifying the integrity of the data during transmission, such as a checksum.
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Executive Summary

This vulnerability occurs when there is a zone transition from NSEC to NSEC3 in a DNS system, which might trigger an internal inconsistency.

This inconsistency can cause a denial of service, meaning the affected system or service could become unavailable or stop functioning properly.

Impact Analysis

The primary impact of this vulnerability is a denial of service (DoS).

An attacker could exploit the zone transition inconsistency to disrupt the availability of the affected DNS service, potentially causing interruptions in network or application access.

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