CVE-2026-42387

Insufficient input validation in ZoneToCache

State: Published
Severity: 5.9 Medium
Published: Jun 25, 2026
Updated: Jun 25, 2026
Reserved: Apr 27, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	5.9 Medium	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H	OX

Weaknesses

CWE-20 Improper Input Validation

Affected Products

Product	Versions
RecursorPowerDNS	5.2.0 to before 5.2.11Affected 5.3.0 to before 5.3.8Affected 5.4.0 to before 5.4.3Affected

References

https://docs.powerdns.com/recursor/security-advisories/powerdns-advisory-powerdns-2026-08.html

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