CVE-2026-40012

EUVD-2026-39356
ECS zero scoped answers are stored in the packet cache while they should not. This impacts only configurations that have ECS enabled;
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
OXCNA
5.3 MEDIUM
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Base Score
CVSS 3.x
EPSS Score
Percentile: Unknown
Early Detection
Affected products identified ahead of NVD analysis through intelligence sources.
VendorProductVersionSource
powerdnsrecursor
5.2.0 ≤
𝑥
< 5.2.11
CNA
powerdnsrecursor
5.3.0 ≤
𝑥
< 5.3.8
CNA
powerdnsrecursor
5.4.0 ≤
𝑥
< 5.4.3
CNA
Debian logo
Debian Releases
Debian Product
Codename
pdns-recursor
bookworm
vulnerable
bookworm (security)
vulnerable
bullseye
vulnerable
forky
vulnerable
sid
vulnerable
trixie
vulnerable
trixie (security)
5.2.11-0+deb13u1
fixed
Common Weakness Enumeration
References
https://docs.powerdns.com/recursor/security-advisories/powerdns-advisory-powerdns-2026-08.html