CVE-2026-33593: Denial of service via crafted DNSCrypt query

Published Apr 22, 2026
·
Updated

A client can trigger a divide by zero error leading to crash by sending a crafted DNSCrypt query.

Affected Software

2 affected components
PowerDNS DNSDist>=1.9.0<1.9.13
PowerDNS DNSDist>=2.0.0<2.0.4

Event History

Apr 22, 2026
CVE Published
via MITRE·01:48 PM
Data Sourced
via MITRE·01:48 PM
DescriptionSeverityWeakness
Data Sourced
via NVD·02:16 PM
DescriptionSeverityWeaknessAffected Software
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Frequently Asked Questions

1

What is the severity of CVE-2026-33593?

The severity of CVE-2026-33593 is considered critical due to its potential to cause a denial of service.

2

How do I fix CVE-2026-33593?

To fix CVE-2026-33593, upgrade to PowerDNS DNSDist version 1.9.13 or higher, or 2.0.4 or higher.

3

What type of attack does CVE-2026-33593 enable?

CVE-2026-33593 enables a divide by zero error that results in a denial of service.

4

Which versions of DNSDist are affected by CVE-2026-33593?

CVE-2026-33593 affects PowerDNS DNSDist versions between 1.9.0 and 1.9.13, and between 2.0.0 and 2.0.4.

5

What triggers the vulnerability in CVE-2026-33593?

The vulnerability in CVE-2026-33593 is triggered by sending a crafted DNSCrypt query.

Contact

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