Bug 2568755 (CVE-2026-123601) - CVE-2026-123601 hickory-proto: hickory-net: Hickory DNS: Denial of service via forged NSEC3 negative responses
Summary: CVE-2026-123601 hickory-proto: hickory-net: Hickory DNS: Denial of service vi...
Keywords:
Status: NEW
Alias: CVE-2026-123601
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
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Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-11-08 02:01 UTC by OSIDB Bzimport
Modified: 2026-11-08 02:52 UTC (History)
15 users (show)

Fixed In Version:
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Description OSIDB Bzimport 2026-11-08 02:01:57 UTC 
Hickory DNS hickory-proto 0.25.0 through 0.26.0-alpha.1 and hickory-net 0.26.0-beta.1 before 0.26.2 invert the relational operators in the wrap-around branch of find_covering_record() in nsec3.rs, so the last NSEC3 record in a zone's hash ring covers every hash except its owner. Attackers able to inject DNS responses can replay that NSEC3 record and its RRSIG to forge DNSSEC-validated negative responses denying legitimate names.
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