Bug 2506619 (CVE-2026-39155) - CVE-2026-39155 knot-dns: knot: Knot DNS: Denial of Service due to incorrect NSEC owner name computation
Summary: CVE-2026-39155 knot-dns: knot: Knot DNS: Denial of Service due to incorrect N...
Keywords:
Status: NEW
Alias: CVE-2026-39155
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On: 2520878 2520879
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-07-23 21:01 UTC by OSIDB Bzimport
Modified: 2026-08-21 03:16 UTC (History)
0 users

Fixed In Version:
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Description OSIDB Bzimport 2026-07-23 21:01:19 UTC 
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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