What’s Vulnerable › Vulnerabilities
CVE-2026-0398: Crafted zones can lead to increased resource usage and crafted CNAME chains can lead to cache poisoning in Recursor
- Severity: medium (CVSS 5.3 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.3% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-02-09 · updated 2026-06-17
- Weakness: CWE-770
Description
Crafted zones can lead to increased resource usage and crafted CNAME chains can lead to cache poisoning in Recursor.
Affected products
- PowerDNS Recursor: from 5.1.0 before 5.1.10; from 5.2.8 before 5.2.8; from 5.3.0 before 5.3.5 — fixed in 5.1.10, 5.2.8, 5.3.5
How to fix
Upgrade to a fixed version: PowerDNS Recursor 5.1.10, 5.2.8, 5.3.5. Check the vendor advisory for mitigations.
References
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