MEDIUM 5.3 Microsoft
CVE-2026-42923
Degradation of service with unbounded NSEC3 hash calculations
Microsoft Security Update 2026-May: Degradation of service with unbounded NSEC3 hash calculations
Affected Products
- azl3 unbound 1.19.1-5 on Azure Linux 3.0
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42923
- https://nvd.nist.gov/vuln/detail/CVE-2026-42923
This medium severity vulnerability with a CVSS score of 5.3 was published on 2026-05-12 via Microsoft. Affected: azl3 unbound 1.19.1-5 on Azure Linux 3.0.
vulnfeed aggregates 9214 vulnerabilities from NVD, CISA KEV,
Ubuntu, Debian, Red Hat, Kubernetes, Exploit-DB, OSS-Security, GitHub and OpenStack — updated every 4 hours.