What is CVE-2026-123584?

CVE-2026-123584 is a medium-severity vulnerability in Hickory-Dns, classified under CWE-696. CVSS score: 5.9/10. Published 2026-11-08.

How severe is CVE-2026-123584?

Medium severity. CVSS v3 base score is 5.9 out of 10.

Vulnerability in Hickory-Dns

CVE-2026-123584

The hickory-net crate in Hickory DNS 0.26.0 before 0.26.2 stops listening and returns an error when a client UDP connection receives a datagram that cannot be parsed as a DNS message. Remote attackers who guess the query's source port, without knowing the transaction ID, can spoof malformed responses to abort client queries, causing denial of service.

Published 2026-11-08.

CVSS v3 metric

CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/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-696

References

GitHub Security Advisory (GHSA-v44v-c8m4-gc43) (vendor-advisory)
VulnCheck Advisory: Hickory-DNS 0.26.0 before 0.26.2 UDP Client Denial of Service via Spoofed Responses (third-party-advisory)

Frequently asked questions

What is CVE-2026-123584?: CVE-2026-123584 is a medium-severity vulnerability in Hickory-Dns, classified under CWE-696. CVSS score: 5.9/10. Published 2026-11-08.
How severe is CVE-2026-123584?: Medium severity. CVSS v3 base score is 5.9 out of 10.