CVE-2026-123600
Received Received - Intake

DNSSEC Validation Bypass in Hickory DNS

Publication date: 2026-11-08

Last updated on: 2026-11-08

Assigner: VulnCheck

Description
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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Meta Information

Published
2026-11-08
Last Modified
2026-11-08
Generated
2026-11-08
AI Q&A
2026-11-08
EPSS Evaluated
N/A
NVD
CVE-2026-123600
EUVD
EUVD-2026-119359

Affected Vendors & Products

Showing 2 associated CPEs
Vendor Product Version / Range
hickory hickory-proto From 0.25.0-alpha.3 (inc) to 0.25.2 (inc)
hickory hickory-net From 0.26.0-alpha.1 (inc) to 0.26.2 (exc)

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-358 The product does not implement or incorrectly implements one or more security-relevant checks as specified by the design of a standardized algorithm, protocol, or technique.

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Executive Summary

Hickory DNS versions 0.25.0-alpha.3 through 0.25.2 and 0.26.0-alpha.1 before 0.26.2 have a DNSSEC validation flaw. The issue is in DnssecDnsHandle, where NSEC3-signed NODATA responses for zone-apex queries are incorrectly accepted as secure without a matching NSEC3 record for the hashed QNAME. This allows attackers to replay validly signed non-apex NSEC3 records with the zone's signed SOA to serve an authenticated denial of any apex RRtype for the negative-cache TTL.

Impact Analysis

On-path attackers or malicious authoritative servers can exploit this flaw to cause a denial of service for specific DNS queries. This could prevent users from accessing certain domain records, leading to service disruptions. The impact is limited to DNS resolution failures for affected apex queries.

Mitigation Strategies

Update hickory-proto to version 0.25.3 or later and hickory-net to version 0.26.2 or later to address the DNSSEC validation flaw.

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