Resource Exhaustion Vulnerability in Hickory DNS by Hickory
CVE-2026-123575

8.7HIGH

Key Information:

Vendor

Hickory-dns

Status
Hickory-dns
Vendor
CVE Published:
8 November 2026

What is CVE-2026-123575?

Hickory DNS versions before 0.26.2 are vulnerable to a resource exhaustion issue related to its DNS-over-HTTPS (DoH) server. The lack of adequate timeouts and limits for incomplete request bodies allows remote attackers to open DoH connections, sending incomplete requests and keeping these connections alive. This behavior can lead to significant memory being consumed on the server, potentially disrupting service availability.

Affected Version(s)

hickory-dns 0 < 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-before-0...
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

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