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Not in CISA KEV
HIGH severity

CVE-2026-123575 — Hickory-Dns

HIGH

CVE-2026-123575 is a high-severity (CVSS 7.5) CWE-770 vulnerability in hickory-dns hickory-dns. A fix is available — see the affected versions and patch details below.

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…

Published
Updated
Affected
1 product
Patched
See advisory
Exploits
None indexed
Exploitation data as of Nov 8, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Description

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.

Affected Products

1 product · 1 configurations
Application
hickory-dnshickory-dns
< 0.26.2
1 version
0

Detection & mitigation playbook

Vendor / appliance

  1. Detect

    Inventory every hickory-dns hickory-dns deployment and check each version against the affected-products list above.

  2. Fix

    Apply the hickory-dns hickory-dns security patch or hotfix for CVE-2026-123575 on the affected version, following the vendor advisory for your exact build.

  3. Workarounds

    Cap what an attacker can consume: apply request size, rate and timeout limits in front of the affected component, and run it with memory and CPU limits so exhaustion degrades one worker rather than the whole service. Alongside that, restrict the management interface to trusted networks and apply the vendor's recommended configuration mitigations.

Frequently Asked Questions

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.
O3 Security · Runtime Protection

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