Quick answers
- Is CVE-2026-42000 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-42000 being exploited in the wild.
- How severe is CVE-2026-42000?
- Medium severity, with a CVSS score of 6.8, published 21 May 2026.
- Which products and versions are affected?
- PowerDNS Authoritative Server.
- Is there a fix for CVE-2026-42000?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-42000 attacked?
- It is attacked over the network, in a hosted service.
- Am I affected by CVE-2026-42000?
- Check whether you run Powerdns Authoritative Server. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
PowerDNS Authoritative Server is vulnerable to an integrity-impacting flaw due to insufficient validation of names during Authoritative Transfer (AXFR) operations. An attacker capable of providing a zone transfer to a PowerDNS instance could potentially bypass name validation logic to inject records that should otherwise be rejected. The attack requires the attacker to be in a position to initiate or respond to an AXFR request, which typically requires specific network positioning or existing trust relationships (AC:H). Successful exploitation allows for unauthorized modification of DNS data (Integrity: High) but does not directly lead to data disclosure or service downtime. Users are advised to review their PowerDNS security advisories for specific version patches.
Affected products
- PowerDNS Authoritative Server
Timeline
- 2026-05-21: advisory: Initial disclosure of CVE-2026-42000