Divide by Zero Error in DNSCrypt Queries of PowerDNS Security Software
CVE-2026-33593

7.5HIGH

Key Information:

Vendor

Powerdns

Status
Dnsdist
Vendor
CVE Published:
22 April 2026

What is CVE-2026-33593?

A vulnerability has been identified in PowerDNS that allows an attacker to exploit a divide by zero error through specially crafted DNSCrypt queries. When such a query is received, it can lead to a crash of the DNSDist server, potentially impacting service availability. This issue emphasizes the importance of proper input validation and error handling in DNS services to prevent disruptions.

Affected Version(s)

DNSdist 1.9.0 < 1.9.13

DNSdist 2.0.0 < 2.0.4

References

https://www.dnsdist.org/security-advisories/powerdns-advi...

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Haruto Kimura (Stella)
.