CVE-2026-42387 - Vulnerability Details - OpenCVE

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.

Published: 2026-06-25

Score: 5.9 Medium

EPSS: n/a

KEV: No

Impact:

Action:

Analysis

No analysis available yet.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

PowerDNS

Recursor

unaffected

Version	Status	Constraints
`5.2.0`	affected	< 5.2.11
`5.3.0`	affected	< 5.3.8
`5.4.0`	affected	< 5.4.3

No data.

No data.

No data available yet.

Remediation

No remediation available yet.

Tracking

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Advisories

No advisories yet.

No CVSS v4.0

Attack Vector Network

Attack Complexity High

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Exploitation none

Automatable no

Technical Impact partial

References

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

History

Thu, 25 Jun 2026 15:30:00 +0000

Type	Values Removed	Values Added
Weaknesses		CWE-20
Metrics		ssvc `{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}`

Thu, 25 Jun 2026 14:00:00 +0000

Type	Values Removed	Values Added
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.
Title		Insufficient input validation in ZoneToCache
References		https://docs.powerdns.com/recursor/security-advisories/powerdns-advisory-powerdns-2026-08.html
Metrics		cvssV3_1 `{'score': 5.9, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H'}`

Subscriptions

No data.

MITRE

Status: PUBLISHED

Assigner: OX

Published: 2026-06-25T12:59:16.813Z

Updated: 2026-06-25T14:41:46.920Z

Reserved: 2026-04-27T08:53:58.838Z

Link: CVE-2026-42387

Vulnrichment

Updated: 2026-06-25T14:41:43.087Z

NVD

No data.

Redhat

No data.

OpenCVE Enrichment

No data.

Weaknesses

CWE-20
Improper Input Validation

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