MNBSD-2026-52: degradation of service with unbounded NSEC3 hash calculations

Description

Unbounded NSEC3 hash calculations can cause a degradation of service (Denial of Service). Reported by Qifan Zhang, Palo Alto Networks.

Affected Versions

unbound

Recommendations

No specific recommendations provided.

References

• https://nvd.nist.gov/vuln/detail/CVE-2026-42923
• https://nlnetlabs.nl/projects/unbound/security-advisories/

Additional Information

Aliases: CVE-2026-42923

Published: June 11, 2026
Last Modified: June 11, 2026