CVE-2026-42387 — MEDIUM (5.9)

Vulnerability Description

A malicious authoritative server can send a crafted zone via the ZoneToCache function that leads to a crash of the Recursor due to insuffcient input validation.

CVSS Score

5.9

MEDIUM

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

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

NONE

Integrity

NONE

Availability

HIGH

Related Weaknesses (CWE)

CWE-20

References

https://docs.powerdns.com/recursor/security-advisories/powerdns-advisory-powerdn

FAQ

What is CVE-2026-42387?

CVE-2026-42387 is a vulnerability with a CVSS score of 5.9 (MEDIUM). A malicious authoritative server can send a crafted zone via the ZoneToCache function that leads to a crash of the Recursor due to insuffcient input validation.

How severe is CVE-2026-42387?

CVE-2026-42387 has been rated MEDIUM with a CVSS base score of 5.9/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-42387?

Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.