What is CVE-2026-123608?

CVE-2026-123608 is a high-severity vulnerability in Hickory-Dns, classified under Inefficient Algorithmic Complexity. CVSS score: 7.5/10. Published 2026-11-08.

How severe is CVE-2026-123608?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Hickory-Dns

CVE-2026-123608

Hickory DNS hickory-proto from 0.3.1 before 0.26.1 contains a denial of service vulnerability in BinEncoder that allows remote attackers to exhaust CPU through quadratic-time name compression. Attackers can send malicious DNS messages with many records that add many candidate labels and trigger repeated linear scans during encoding, amplifying CPU exhaustion.

Published 2026-11-08.

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

Hickory-Dns

Weakness classification (CWE)

CWE-407 — Inefficient Algorithmic Complexity

References

GitHub Security Advisory (GHSA-q2qq-hmj6-3wpp) (vendor-advisory)
VulnCheck Advisory: Hickory DNS hickory-proto 0.3.1 before 0.26.1 CPU Exhaustion via BinEncoder Name Compression (third-party-advisory)

Frequently asked questions

What is CVE-2026-123608?: CVE-2026-123608 is a high-severity vulnerability in Hickory-Dns, classified under Inefficient Algorithmic Complexity. CVSS score: 7.5/10. Published 2026-11-08.
How severe is CVE-2026-123608?: High severity. CVSS v3 base score is 7.5 out of 10.