Negative Response Forgery in Hickory DNS by Hickory Inc.
CVE-2026-123601

8.3HIGH

Key Information:

Vendor

Hickory-dns

Status
Hickory-dns
Vendor
CVE Published:
8 November 2026

What is CVE-2026-123601?

A vulnerability in Hickory DNS versions hickory-proto 0.25.0 and 0.26.0-alpha.1, along with hickory-net 0.26.0-beta.1, allows attackers to manipulate DNS responses by exploiting an inversion bug in the find_covering_record() function. This flaw allows an attacker to replay forged NSEC3 records, which can lead to DNSSEC-validated negative responses. Consequently, legitimate domain names may be denied, impairing users' ability to access essential services.

Affected Version(s)

hickory-dns 0.26.0-beta.1 < 0.26.2

hickory-dns 0.25.0 <= 0.26.0-alpha.1

hickory-dns 0.26.2

References

https://github.com/hickory-dns/hickory-dns/security/advis...
vendor-advisory
https://www.vulncheck.com/advisories/hickory-dns-0.26.0-b...
third-party-advisory

CVSS V4

Score:
8.3
Severity:
HIGH
Confidentiality:
None
Integrity:
Low
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
Physical
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

qifan-sailboat
.