What is CVE-2026-123575?

CVE-2026-123575 is a high-severity vulnerability in Hickory-Dns, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 7.5/10. Published 2026-11-08.

How severe is CVE-2026-123575?

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

Resource exhaustion in Hickory-Dns

CVE-2026-123575

Hickory DNS before 0.26.2 contains a resource exhaustion vulnerability in its DNS-over-HTTPS HTTP/2 server that lacks sufficient timeouts or limits for incomplete request bodies. Remote attackers can open DoH connections, send incomplete request bodies, and hold connections open to exhaust server memory.

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

EPSS: 0.004 (35.5th percentile), scored 2026-11-09.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 35th percentile — 35.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

The 30-day trend appears once there are two daily scores.

Affected products

Hickory-Dns

Weakness classification (CWE)

CWE-770 — Allocation of Resources Without Limits or Throttling

References

github.com/hickory-dns/hickory-dns/security/advisories/GHSA-g5xf-qv55-wv37 (vendor-advisory)
www.vulncheck.com/advisories/hickory-dns-before-0.26.2-doh-memory-exhaustion-vi… (third-party-advisory)

Frequently asked questions

What is CVE-2026-123575?: CVE-2026-123575 is a high-severity vulnerability in Hickory-Dns, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 7.5/10. Published 2026-11-08.
How severe is CVE-2026-123575?: High severity. CVSS v3 base score is 7.5 out of 10.