What is CVE-2026-42254?

CVE-2026-42254 is a medium-severity vulnerability in Hickory Project DNS, classified under Use of Incorrectly-Resolved Name or Reference. CVSS score: 4.0/10. Published 2026-04-26.

How severe is CVE-2026-42254?

Medium severity. CVSS v3 base score is 4.0 out of 10.

Vulnerability in Hickory Project DNS

CVE-2026-42254

Hickory DNS hickory-recursor 0.1 through 0.25.2 allows cross-zone poisoning because cached data is not directly associated with a query that triggered a response.

Published 2026-04-26 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.0 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N.

EPSS exploit prediction

EPSS: 0.003 (16.0th percentile), scored 2026-10-19.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 16th percentile — 16.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.002 · newest: 0.003 · change: +0.001

Affected products

Hickory Project DNS — versions 0.1

Weakness classification (CWE)

CWE-706 — Use of Incorrectly-Resolved Name or Reference

References

github.com/hickory-dns/hickory-dns/security/advisories/GHSA-83hf-93m4-rgwq

Frequently asked questions

What is CVE-2026-42254?: CVE-2026-42254 is a medium-severity vulnerability in Hickory Project DNS, classified under Use of Incorrectly-Resolved Name or Reference. CVSS score: 4.0/10. Published 2026-04-26.
How severe is CVE-2026-42254?: Medium severity. CVSS v3 base score is 4.0 out of 10.