CVE-2026-33262 PowerDNS CVE debrief

Who should care

Defenders responsible for DNS resolution services, especially those using PowerDNS Recursor, should assess potential exposure and impact. This includes verifying exposure by checking PowerDNS Recursor versions in use, assessing potential impact on DNS resolution services, and applying patches or updates to affected versions. Additionally, defenders should monitor for potential denial of service attempts and review 3

Why it matters

CVE-2026-33262 is a medium-severity vulnerability in PowerDNS Recursor, which can be exploited to cause a denial of service. Defenders should prioritize verifying exposure and assessing potential impact, especially in environments using affected versions.

• Potential denial of service impact on DNS resolution services
• Need to verify exposure and assess potential impact
• Priority to apply patches or updates to affected versions
• Monitoring for potential denial of service attempts

Technical summary

The vulnerability is caused by a missing consistency check, leading to a null pointer dereference. An attacker can send replies that result in a denial of service. Cookies are disabled by default. This vulnerability affects PowerDNS Recursor versions 5.2.0 to 5.2.9, 5.3.0 to 5.3.6, and 5.4.0. Defenders should prioritize verifying exposure and assessing potential impact, especially in environments using affected versions.

Defensive priority

Defenders should prioritize verifying exposure and assessing potential impact, especially in environments using PowerDNS Recursor versions 5.2.0 to 5.2.9, 5.3.0 to 5.3.6, and 5.4.0.

Recommended defensive actions

• Verify exposure by checking PowerDNS Recursor versions in use
• Assess potential impact on DNS resolution services
• Apply patches or updates to affected versions
• Monitor for potential denial of service attempts

Evidence notes

The CVE record and NVD vulnerability detail page provide information on the vulnerability, including its description, CVSS score, and affected versions.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.