CVE-2026-52686

EUVD-2026-47931
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.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
OXCNA
3.7 LOW
NETWORK
HIGH
NONE
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
Base Score
CVSS 3.x
EPSS Score
Percentile: 17%
Early Detection
Affected products identified ahead of NVD analysis through intelligence sources.
VendorProductVersionSource
powerdnsrecursor
5.2.0 ≤
𝑥
< 5.2.12
CNA
powerdnsrecursor
5.3.0 ≤
𝑥
< 5.3.9
CNA
powerdnsrecursor
5.4.0 ≤
𝑥
< 5.4.4
CNA
Debian logo
Debian Releases
Debian Product
Codename
pdns-recursor
bookworm
vulnerable
bookworm (security)
vulnerable
bullseye
vulnerable
forky
vulnerable
sid
5.4.4-1
fixed
trixie
vulnerable
trixie (security)
5.2.12-0+deb13u1
fixed
Common Weakness Enumeration
References
https://docs.powerdns.com/recursor/security-advisories/powerdns-advisory-powerdns-2026-10.html