Bug 2568779 (CVE-2026-123600) - CVE-2026-123600 hickory-proto: hickory-net: Hickory DNS: Denial of Service via improper DNSSEC validation of negative responses
Summary: CVE-2026-123600 hickory-proto: hickory-net: Hickory DNS: Denial of Service vi...
Keywords:
Status: NEW
Alias: CVE-2026-123600
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-11-08 02:06 UTC by OSIDB Bzimport
Modified: 2026-11-08 03:05 UTC (History)
15 users (show)

Fixed In Version:
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Description OSIDB Bzimport 2026-11-08 02:06:15 UTC 
Hickory DNS hickory-proto 0.25.0-alpha.3 through 0.25.2 and hickory-net 0.26.0-alpha.1 before 0.26.2 contain a DNSSEC validation flaw in DnssecDnsHandle that accepts NSEC3-signed NODATA responses for zone-apex queries as secure without an NSEC3 record matching the hashed QNAME. On-path attackers or malicious authoritative servers can replay a validly signed non-apex NSEC3 with the zone's signed SOA to serve an authenticated (AD=1) denial of any apex RRtype for the negative-cache TTL.
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