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CVE-2026-123570

7.5, high

hickory-dns Uncontrolled Resource Consumption Vulnerability

NVD (opens in a new tab) CVE.org (opens in a new tab)
CVSS
7.5, high high CVSS v3.1
EPSS, next 30 days
n/a
Exploitation
No public evidence
Published
8 Nov 2026today

Description

The DNS wire-format message parser in hickory-proto (Hickory DNS) 0.18 before 0.26.2 preallocates record vectors sized by the untrusted ANCOUNT, NSCOUNT, and ARCOUNT header fields before reading record data. Remote attackers can send a UDP datagram, or a spoofed response to a client/resolver, with these counts set to 65535, forcing about 18MB of allocation per message.

Details

Vendor
Hickory-dns
Product
hickory-dns
Weakness
CWE-400 (opens in a new tab)
Status
Received
Updated
8 Nov 2026
Assigner
disclosure@vulncheck.com

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

References 2

Advisories 1

Other references 1

The kind is read from NVD's tags where present and from the shape of the URL otherwise, so treat it as a hint.

Other Hickory-dns CVEs

Every Hickory-dns CVE we hold

Same vendor in what we hold, not a known link between the flaws.

  • CVE-2026-123571 hickory-dns Integer Underflow Vulnerability 7.5, high
  • CVE-2026-123572 Hickory-dns from 0.20.1 before 0.26.2 contains a denial of service vulnerability in the hickory-proto SVCB and HTTPS record presentation… 7.5, high
  • CVE-2026-123573 hickory-dns Improper Input Validation Vulnerability 7.5, high
  • CVE-2026-123574 hickory-dns Improper Input Validation Vulnerability 7.5, high
  • CVE-2026-123575 hickory-dns Allocation of Resources Without Limits or Throttling Vulnerability 7.5, high
  • CVE-2026-123576 hickory-dns Allocation of Resources Without Limits or Throttling Vulnerability 7.5, high
  • CVE-2026-123577 hickory-dns Allocation of Resources Without Limits or Throttling Vulnerability 7.5, high
  • CVE-2026-123580 Hickory DNS hickory-net 0.26.0-beta.1 before 0.26.2 and hickory-proto through 0.26.0-alpha.1 perform insufficient checks on NSEC3 record… 7.5, high

Beyond this page

Is CVE-2026-123570 in your network?

This page tells you how dangerous CVE-2026-123570 is out there. Whether it sits on one of your devices, only a scan of your own network can tell. That is what our systems do, every day, for the companies we protect.

  • EXYS7600 OCELOT

    Find it before attackers do

    Ocelot scans your network on a schedule and reports every vulnerability it finds by its CVE identifier, with its CVSS score and how many of your hosts are affected. A finding like CVE-2026-123570 comes with the devices to patch.

    Learn more about EXYS7600 OCELOT

  • EXYS7950 KONDRA

    Detect it if it's exploited

    Until the patch is applied, Kondra monitors your network, events and endpoints in real time. It keeps an inventory of the software installed on every endpoint, and its anomaly detection rules flag what an attacker does once inside.

    Learn more about EXYS7950 KONDRA
Check your exposure

Assembled from the NVD 2.0 API, the CISA Known Exploited Vulnerabilities Catalog and FIRST EPSS. Scores are as of our last collection on 8 Nov 2026, not the live upstream state.