CVE-2026-39155

—

CVSS 3.1

6.5 medium

EPSS

<1%p5

Published

Jul 23, 2026 (Jul 23, 2026)

Modified

Jul 30, 2026

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.

Weakness: CWE-345
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

NVD CVE.org GitHub PoCs EPSS (0.1%)

In the news0 stories

No ingested article mentions this CVE yet.