What’s Vulnerable › Vulnerabilities
CVE-2026-52686: Wildcard CNAME proof validation bypass
- Severity: low (CVSS 3.7 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.2% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-07-23 · updated 2026-10-24
- Weakness: CWE-347
Description
The issue is a DNSSEC validation bypass where wildcard expansion proofs (NSEC/NSEC3 records) are accepted without signature validation when the wildcard answer is a CNAME or DNAME record.
Affected products
- PowerDNS Recursor: from 5.2.0 before 5.2.12; from 5.3.0 before 5.3.9; from 5.4.0 before 5.4.4 — fixed in 5.2.12, 5.3.9, 5.4.4
How to fix
Upgrade to a fixed version: PowerDNS Recursor 5.2.12, 5.3.9, 5.4.4. Check the vendor advisory for mitigations.
References
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