Improper input validation in Hickory-Dns
CVE-2026-123574
The zone file parser in the hickory-proto crate of Hickory DNS 0.24.0 before 0.26.2 panics when a single token in a zone file is 4096 bytes or longer. Attackers who can supply untrusted zone files to an application using the parser can trigger the panic to cause a denial of service.
Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)
Published .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- GitHub Security Advisory (GHSA-4rph-pmrw-mwpw) (vendor-advisory)
- VulnCheck Advisory: Hickory DNS 0.24.0 before 0.26.2 Denial of Service via Zone File Parser (third-party-advisory)
Frequently asked questions
- What is CVE-2026-123574?
- CVE-2026-123574 is a high-severity vulnerability in Hickory-Dns, classified under Improper Input Validation. CVSS score: 7.5/10. Published 2026-11-08.
- How severe is CVE-2026-123574?
- High severity. CVSS v3 base score is 7.5 out of 10.