CVE-2026-42387

MEDIUM

PowerDNS Recursor - Insufficient Input Validation in ZoneToCache

Title source: rule

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.

References (1)

Core 1

Core References

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

Scores

CVSS v3 5.9

EPSS 0.0039

EPSS Percentile 31.3%

Attack Vector NETWORK

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

CISA SSVC

Vulnrichment

Exploitation none

Automatable no

Technical Impact partial

Details

CWE

CWE-20

Status published

Products (3)

PowerDNS/Recursor 5.2.0 - 5.2.11

PowerDNS/Recursor 5.3.0 - 5.3.8

PowerDNS/Recursor 5.4.0 - 5.4.3

Published Jun 25, 2026

Tracked Since Jun 25, 2026