CVE-2026-123606highCWE-400

CVE-2026-123606: high-severity vulnerability in hickory-dns

Hickory-DNS Recursor 0.25.0-alpha.3 through 0.25.2 Glueless-NS Referral Amplification

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18Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackcvss 8.7
The hickory-dns recursor in hickory-recursor 0.25.0-alpha.3 through 0.25.2 and hickory-resolver 0.26.0-alpha.1 before 0.26.2 iterates every out-of-bailiwick NS target lacking glue in a referral without any per-query work budget. Remote attackers can serve such referrals to force A and AAAA lookups per target, amplifying traffic against remote servers or exhausting recursor resources.
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Affected products
hickory-dns · hickory-dns
Related CVEs — hickory-dns

In the same product, most dangerous first.

CVE-2025-25188MEDIUMDNSSEC validation may accept broken authentication chainsEPSS 0.3%CVE-2026-123608HIGHHickory DNS hickory-proto 0.3.1 before 0.26.1 CPU Exhaustion via BinEncoder Name CompressionEPSS —CVE-2026-123607HIGHHickory DNS NSEC3 Closest-Encloser Proof Unbounded Loop Denial of ServiceEPSS —CVE-2026-123605HIGHHickory DNS through 0.25.0-alpha.3 DNSSEC Validation Bypass via RRSIG Signer's NameEPSS —CVE-2026-123604HIGHHickory DNS 0.26.0-beta.1 before 0.26.2 Resource Exhaustion DoS via NameServerPool::try_send TC-Retry LoopEPSS —CVE-2026-123603MEDIUMHickory DNS Missing IPv4-Mapped IPv6 Canonicalization Access Control BypassEPSS —