CVE-2026-123589

MEDIUM 5.3

Hickory DNS before 0.26.2 Denial of Service via Missing DNS-over-QUIC Request Read Timeout

CVSS Score

5.3

EPSS Score

0.0%

EPSS Percentile

0th

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.

Vendor	hickory-dns
Product	hickory-dns
Published	Nov 8, 2026

Stay Ahead of the Next One

Get instant alerts for hickory-dns hickory-dns

Be the first to know when new medium vulnerabilities affecting hickory-dns hickory-dns are published — delivered to Slack, Telegram or Discord.

Get Free Alerts → Free · No credit card · 60 sec setup

CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

Low

Affected Versions

hickory-dns / hickory-dns

0 < 0.26.2

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/hickory-dns/hickory-dns/security/advisories/GHSA-g8wg-4mwh-fjfv vulncheck.com: https://www.vulncheck.com/advisories/hickory-dns-before-0.26.2-denial-of-service-via-missing-dns-over-quic-request-read-timeout

Credits

🔍 N0zoM1z0