CVE-2026-123575

HIGH 7.5

Hickory DNS before 0.26.2 DoH Memory Exhaustion via Incomplete Request Bodies

CVSS Score

7.5

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-770
Vendor	hickory-dns
Product	hickory-dns
Published	Nov 8, 2026

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CVSS v3 Breakdown

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

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-g5xf-qv55-wv37 vulncheck.com: https://www.vulncheck.com/advisories/hickory-dns-before-0.26.2-doh-memory-exhaustion-via-incomplete-request-bodies