Vulnerability in Hickory-Dns
CVE-2026-123589
The DNS-over-QUIC (DoQ) server in hickory-server (hickory-dns) before 0.26.2 does not apply any timeout when reading a request message from a QUIC stream, bypassing all configured timeouts. A remote unauthenticated client can open a connection and a request stream and hold it open indefinitely, consuming server resources and causing a denial of service.
Published .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.
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
References
- GitHub Security Advisory (GHSA-g8wg-4mwh-fjfv) (vendor-advisory)
- VulnCheck Advisory: Hickory DNS before 0.26.2 Denial of Service via Missing DNS-over-QUIC Request Read Timeout (third-party-advisory)
Frequently asked questions
- What is CVE-2026-123589?
- CVE-2026-123589 is a medium-severity vulnerability in Hickory-Dns. CVSS score: 5.3/10. Published 2026-11-08.
- How severe is CVE-2026-123589?
- Medium severity. CVSS v3 base score is 5.3 out of 10.