CVE-2026-40012: medium-severity vulnerability in PowerDNS Recursor
Information about ECS zero scoped answers might leak to clients that use a specific ECS
Published
13Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 5.3epss 0.5%
exploitation probability
0.5%top 63% of all CVEs
observed exploitation
nono source reports it
ECS zero scoped answers are stored in the packet cache while they should not. This impacts only configurations that have ECS enabled;
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Affected products
PowerDNS · RecursorRelated CVEs — PowerDNS Recursor
In the same product, most dangerous first.
CVE-2026-33260MEDIUMInsufficient input validation of internal webserverEPSS 1.1%CVE-2026-33257MEDIUMInsufficient input validation of internal webserverEPSS 1.1%CVE-2024-25583HIGHCrafted responses can lead to a denial of service in Recursor if recursive forwarding is configuredEPSS 0.8%CVE-2026-33258MEDIUMCrafted zones can cause increased resource usageEPSS 0.8%CVE-2026-33256MEDIUMUnbounded memory allocation by internal web serverEPSS 0.8%CVE-2025-30195HIGHA crafted zone can lead to an illegal memory access in the PowerDNS RecursorEPSS 0.8%