Insufficient Validation in PowerDNS Could Lead to Zone Transfer Failures
CVE-2026-42396

4.9MEDIUM

Key Information:

Vendor

Powerdns

Status
Authoritative
Vendor
CVE Published:
21 May 2026

What is CVE-2026-42396?

An insufficient validation flaw in the PowerDNS Authoritative Server can result in a failure during catalog zone transfers. This vulnerability arises when member zone data is not properly validated, potentially leading to misconfigurations or denial of service during zone transfer processes. DNS administrators are recommended to verify their configurations to mitigate the risks associated with this vulnerability.

Affected Version(s)

Authoritative 4.9.0 < 4.9.15

Authoritative 5.0.0 < 5.0.5

References

https://docs.powerdns.com/authoritative/security-advisori...

CVSS V3.1

Score:
4.9
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
High
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

ilhamaf
.