CVE-2026-33593: Divide By Zero in PowerDNS DNSdist
A client can trigger a divide by zero error leading to crash by sending a crafted DNSCrypt query.
AI Analysis
Technical Summary
PowerDNS DNSdist versions 1.9.0 and 2.0.0 contain a vulnerability (CVE-2026-33593) where a crafted DNSCrypt query can trigger a divide by zero error, causing the DNSdist process to crash. This is a denial-of-service vulnerability with a CVSS 3.1 base score of 7.5, reflecting high severity due to the ease of remote exploitation without privileges or user interaction. The vulnerability affects availability only and does not compromise data confidentiality or integrity. No vendor advisory or patch information is currently available.
Potential Impact
Successful exploitation results in a denial of service by crashing the DNSdist service, leading to potential disruption of DNS traffic handling. There is no impact on data confidentiality or integrity. The vulnerability can be triggered remotely without authentication.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, consider implementing network-level protections to restrict access to DNSdist from untrusted sources or monitoring for anomalous DNSCrypt queries that could trigger the crash.
CVE-2026-33593: Divide By Zero in PowerDNS DNSdist
Description
A client can trigger a divide by zero error leading to crash by sending a crafted DNSCrypt query.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
PowerDNS DNSdist versions 1.9.0 and 2.0.0 contain a vulnerability (CVE-2026-33593) where a crafted DNSCrypt query can trigger a divide by zero error, causing the DNSdist process to crash. This is a denial-of-service vulnerability with a CVSS 3.1 base score of 7.5, reflecting high severity due to the ease of remote exploitation without privileges or user interaction. The vulnerability affects availability only and does not compromise data confidentiality or integrity. No vendor advisory or patch information is currently available.
Potential Impact
Successful exploitation results in a denial of service by crashing the DNSdist service, leading to potential disruption of DNS traffic handling. There is no impact on data confidentiality or integrity. The vulnerability can be triggered remotely without authentication.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, consider implementing network-level protections to restrict access to DNSdist from untrusted sources or monitoring for anomalous DNSCrypt queries that could trigger the crash.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- OX
- Date Reserved
- 2026-03-23T12:57:56.813Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 69e8d83319fe3cd2cdbdac07
Added to database: 4/22/2026, 2:16:19 PM
Last enriched: 4/22/2026, 2:31:10 PM
Last updated: 4/23/2026, 1:11:18 AM
Views: 9
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