CVE-2026-123572

HIGH 7.5

Hickory-dns 0.20.1 before 0.26.2 Panic DoS via SVCB/HTTPS Zone Parser

CVSS Score

7.5

EPSS Score

0.0%

EPSS Percentile

0th

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, which panics on malformed alpn values. Attackers can supply untrusted zone files with unbalanced quotes, consecutive commas, or invalid escapes in alpn parameters to crash parsing processes.

CWE	CWE-1286
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

0.20.1 < 0.26.2

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/hickory-dns/hickory-dns/security/advisories/GHSA-hx8c-fjhc-hmf5 vulncheck.com: https://www.vulncheck.com/advisories/hickory-dns-0.20.1-before-0.26.2-panic-dos-via-svcb-https-zone-parser

Credits

🔍 kirk-baird