Quick answers
- Is CVE-2026-42002 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-42002 being exploited in the wild.
- How severe is CVE-2026-42002?
- Medium severity, with a CVSS score of 5.9, published 21 May 2026.
- Which products and versions are affected?
- PowerDNS Authoritative Server.
- Is there a fix for CVE-2026-42002?
- 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-2026-42002 attacked?
- It is attacked over the network, in a hosted service.
- Am I affected by CVE-2026-42002?
- 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
A vulnerability exists in the GSS-TSIG (Generic Security Service Algorithm for Secret Key Transaction Authentication for DNS) implementation of PowerDNS Authoritative Server. The flaw is rooted in improper concurrency management and locking defects. A remote, unauthenticated attacker can exploit these race conditions or locking issues over the network, though the attack complexity is rated as high, likely requiring specific timing or high-volume traffic to trigger the defect. Successful exploitation results in a denial of service (DoS) by impacting the availability of the DNS service. The vulnerability was reported by Open-Xchange and is tracked as CVE-2026-42002.
Affected products
- PowerDNS Authoritative Server
Timeline
- 2026-05-21: advisory: NVD published the CVE record based on Open-Xchange data.