DNS Amplification Vulnerability in Hickory-DNS Recursor and Resolver
CVE-2026-123606

8.7HIGH

Key Information:

Vendor

Hickory-dns

Status
Hickory-dns
Vendor
CVE Published:
8 November 2026

What is CVE-2026-123606?

The hickory-dns recursor in specific versions allows remote attackers to exploit glueless NS referrals, leading to excessive A and AAAA lookups. This issue can result in traffic amplification directed at remote servers and significant resource exhaustion on the recursor itself, creating a potential denial of service. It is crucial for users of the affected versions to take immediate action to mitigate this vulnerability.

Affected Version(s)

hickory-dns 0.25.0-alpha.3 <= 0.25.2

hickory-dns 0.26.0-alpha.1 < 0.26.2

hickory-dns 0.26.2

References

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

CVSS V4

Score:
8.7
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

qifan-sailboat
.