CVE-2026-123580
Received Received - Intake

Insufficient NSEC3 Record Validation in Hickory DNS

Publication date: 2026-11-08

Last updated on: 2026-11-08

Assigner: VulnCheck

Description
Hickory DNS hickory-net 0.26.0-beta.1 before 0.26.2 and hickory-proto through 0.26.0-alpha.1 perform insufficient checks on NSEC3 record names during DNSSEC verification, comparing only the hashed label without confirming the record belongs to the correct zone. Attackers can supply NSEC3 records from another zone with a matching hash label to forge DNSSEC nonexistence proofs.

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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-2026-123580
EUVD
EUVD-2026-119339

Affected Vendors & Products

Showing 2 associated CPEs
Vendor Product Version / Range
hickory_net hickory_dns to 0.26.2 (exc)
hickory_net hickory_proto From 0.26.0-alpha.1 (inc) to 0.26.0 (inc)

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-290 This attack-focused weakness is caused by incorrectly implemented authentication schemes that are subject to spoofing attacks.

Attack-Flow Graph

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Executive Summary

This vulnerability affects Hickory DNS versions hickory-net 0.26.0-beta.1 before 0.26.2 and hickory-proto through 0.26.0-alpha.1. It involves insufficient checks on NSEC3 record names during DNSSEC verification. Attackers can exploit this by providing NSEC3 records from another zone with a matching hash label to forge DNSSEC nonexistence proofs.

Impact Analysis

This vulnerability allows attackers to forge DNSSEC nonexistence proofs, potentially leading to cache poisoning, misdirection to malicious sites, or bypassing security controls. It could result in users being served incorrect or malicious DNS responses without detection.

Mitigation Strategies

Update Hickory DNS hickory-net to version 0.26.2 or later and hickory-proto to a version beyond 0.26.0-alpha.1 to address the insufficient NSEC3 record checks.

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