CVE-2026-66374
nic Knot ResolverVulnerabilityCVSS 8.1
Knot Resolver before 6.4.1 allows remote code execution via a heap-based buffer overflow in the DoQ (DNS-over-QUIC) receive path.
No public exploitation has been reported so far. No distribution fix is listed yet; apply vendor mitigations and monitor.
Recommended action: Track your distribution's security tracker and apply the fix as soon as it ships.
Severity metrics
CVSS 3.1 : 8.1 HIGH
Attack vectorNetwork (remote)
Attack complexityHigh
Privileges requiredNone
User interactionNone
ScopeChanged
Confidentiality impactLow
Integrity impactHigh
Availability impactLow
Vector: AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:H/A:L
Affected & fixed versions by distribution
Versions are the native distribution strings (backport-aware): RHEL/Debian/SUSE backport fixes, so compare with the distro version comparator (dpkg / rpm / vercmp), not the upstream version.
No affected package in the tracked watchlist yet (Debian, Ubuntu, Arch, SUSE, Red Hat...). Triage may still be pending.