CVE-2026-42389

EUVD-2026-39388
This fix provides extra hardening for the 5.4.x branch by doing extra validation of incoming answers from authoritative servers.
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:N/I:L/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
5.4.0 ≤
𝑥
< 5.4.3
CNA
Debian logo
Debian Releases
Debian Product
Codename
pdns-recursor
bookworm
4.8.8-1+deb12u1
fixed
bookworm (security)
4.8.8-1+deb12u1
fixed
bullseye
4.4.2-3
fixed
forky
vulnerable
sid
vulnerable
trixie
5.2.9-0+deb13u1
fixed
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