CVE-2026-52686: low-severity vulnerability in PowerDNS Recursor
Wildcard CNAME proof validation bypass
Published
E-mail alert when it lands in KEV, gets a public PoC or its score goes up.
8Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 3.7epss 0.2%
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.
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
Affected products
PowerDNS · RecursorRelated CVEs — PowerDNS Recursor
In the same product, most dangerous first.
CVE-2024-25583HIGHCrafted responses can lead to a denial of service in Recursor if recursive forwarding is configuredEPSS 0.8%CVE-2025-30195HIGHA crafted zone can lead to an illegal memory access in the PowerDNS RecursorEPSS 0.8%CVE-2024-25590HIGHCrafted responses can lead to a denial of service due to cache inefficiencies in the RecursorEPSS 0.7%CVE-2026-33256MEDIUMUnbounded memory allocation by internal web serverEPSS 0.6%CVE-2023-26437LOWDeterred spoofing attempts can lead to authoritative servers being marked unavailableEPSS 0.6%CVE-2025-59030HIGHInsufficient validation of incoming notifies over TCP can lead to a denial of service in RecursorEPSS 0.6%