CVE-2026-42387
Medium
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.
SeverityMedium
CVSS5.9
Exploit probability—
ProductRecursor
PublishedJun 25, 2026
First seenJun 25, 2026
Weakness typeCWE-20Improper input validation
How to fix
Update
- PowerDNS Recursor5.2.11, 5.3.8, 5.4.3 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| PowerDNS Recursor | 5.2.0 ≤ v < 5.2.11, 5.3.0 ≤ v < 5.3.8, 5.4.0 ≤ v < 5.4.3 | 5.2.11, 5.3.8, 5.4.3 |
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