PT-2026-139858

CVE-2026-123577

Published

2026-11-08

Updated

2026-11-08

Description by

CVSS 4.0

8.7

High

MetricsAV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Name of the Vulnerable Software and Affected Versions Hickory DNS versions 0.24.0 through 0.26.1

Description A resource exhaustion issue exists where remote attackers can consume server memory by sending unbounded DNS over HTTPS (DoH) request bodies. By transmitting large request bodies over HTTP/2 or HTTP/3 to a DNS over HTTP server, an attacker can cause memory exhaustion, leading to a denial of service.

Recommendations Update Hickory DNS to version 0.26.2 or later.

Exploitability

Exploit

Fix

Impacts

Researchers

Vendors

Affected products

Weakness enumeration

CWE-770: Allocation of Resources Without Limits or Throttling

Related identifiers

CVE-2026-123577