CVE-2026-123573
Received Received - Intake

Denial of Service in Hickory DNS SVCB/HTTPS Parser

Publication date: 2026-11-08

Last updated on: 2026-11-08

Assigner: VulnCheck

Description
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 format parser. Attackers can supply untrusted zone files where only a single or double quote replaces a service parameter value, triggering a panic that crashes the parsing process.

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Meta Information

Published
2026-11-08
Last Modified
2026-11-08
Generated
2026-11-08
AI Q&A
2026-11-08
EPSS Evaluated
N/A
NVD
CVE-2026-123573
EUVD
EUVD-2026-119332

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
hickory dns to 0.26.2 (exc)

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-20 The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.

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Executive Summary

This vulnerability is a denial of service issue in hickory-dns versions 0.20.1 to 0.26.2. It occurs in the SVCB and HTTPS record parser where attackers can crash the parsing process by supplying untrusted zone files with single or double quotes replacing service parameter values, causing a panic.

Detection Guidance

This vulnerability can be detected by checking the version of hickory-dns in use. If your system is running a version between 0.20.1 and 0.26.1, it is vulnerable. Use commands like 'cargo list --package hickory-proto' for Rust-based installations or check package managers for version details.

Impact Analysis

This vulnerability can cause service disruption by crashing the DNS parsing process. If exploited, it may lead to DNS resolution failures, degraded network performance, or complete outages for systems relying on hickory-dns for DNS services.

Mitigation Strategies

Immediately upgrade hickory-dns to version 0.26.2 or later. If using Rust, run 'cargo update -p hickory-proto'. For system packages, update via your package manager. Ensure all DNS services using hickory-dns are restarted after the update.

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