How severe is CVE-2026-42254?

CVE-2026-42254 has a CVSS 3.x base score of 4.0, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.

Is CVE-2026-42254 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (6th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-42254?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-42254 have an EU (EUVD) identifier?

Yes. CVE-2026-42254 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-25687.

When was CVE-2026-42254 published?

CVE-2026-42254 was published on 2026-04-26 and last updated on 2026-06-17.

CVE-2026-42254

CVE-2026-42254 is a medium-severity vulnerability with a CVSS 3.x base score of 4.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-706.

Key facts

Severity: Medium (CVSS 3.x base score 4.0)
EPSS exploit prediction: 0% (6th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-25687
Weakness: CWE-706
Published: 2026-04-26
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is 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.
How severe is CVE-2026-42254?: CVE-2026-42254 has a CVSS 3.x base score of 4.0, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.
Is CVE-2026-42254 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (6th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-42254?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-42254 have an EU (EUVD) identifier?: Yes. CVE-2026-42254 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-25687.
When was CVE-2026-42254 published?: CVE-2026-42254 was published on 2026-04-26 and last updated on 2026-06-17.

References

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

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