DNS Cache Vulnerability in PowerDNS Recursor by PowerDNS
CVE-2026-33258

5.3MEDIUM

Key Information:

Vendor

Powerdns

Status
Recursor
Vendor
CVE Published:
22 April 2026

What is CVE-2026-33258?

An attacker can exploit a vulnerability in PowerDNS Recursor by publishing and querying a specially crafted DNS zone. This action can lead to the allocation of oversized entries in the negative and aggressive NSEC(3) caches, potentially impacting the performance and security of DNS resolution.

Affected Version(s)

Recursor 5.4.0 < 5.4.1

Recursor 5.3.0 < 5.3.6

Recursor 5.2.0 < 5.2.9

References

https://docs.powerdns.com/recursor/security-advisories/po...

CVSS V3.1

Score:
5.3
Severity:
MEDIUM
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)
.