Security Advisory

CVE-2026-39155

CVE vulnerability detail - eXtreme Datacenter Security Operations

Published 2026-07-23 00:00:00

Last updated 2026-07-24 19:35:57

Assigner mitre

CVSS score not scored

State PUBLISHED

Description

Knot DNS before 3.4.10 and 3.5.x before 3.5.4 contains a vulnerability in mod-onlinesign where the next NSEC owner name can be computed incorrectly. This can create an overly broad authenticated denial interval, allowing downstream validating resolvers using aggressive negative caching to synthesize negative answers for legitimate names and causing resolver-side denial of service.

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