CVE-2026-123596High· 8.8▾ TwilightHickory DNS hickory-proto through 0.26.0-alpha.1 and hickory-net 0.26.0-beta.1 before 0.26.2 contain a DNSSEC validation flaw in the validating recursor's NSEC handler that accepts parent-side ancestor-delegation NSEC records as proof of…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 48.4 · likelihood 0 · exploitation 0
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Hickory DNS hickory-proto through 0.26.0-alpha.1 and hickory-net 0.26.0-beta.1 before 0.26.2 contain a DNSSEC validation flaw in the validating recursor's NSEC handler that accepts parent-side ancestor-delegation NSEC records as proof of nonexistence for names below the zone cut. An on-path attacker, rogue parent nameserver, or attacker winning a port and TXID race can deliver one forged NXDOMAIN response built from genuinely signed parent NSEC records, causing authenticated denial of existing child-zone names cached for the negative TTL.
hickory-dns <= 0.26.0-alpha.1hickory-dns >= 0.26.0-beta.1 < 0.26.2Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
CVE-2026-123581Medium· 5.3Hickory DNS through 0.26.0-alpha.1 DNSSEC Validation Bypass via Unrelated RRset
CVE-2026-123582Low· 3.7Hickory DNS 0.25.0 before 0.26.2 DNSSEC Validation Bypass via SOA Record
CVE-2026-123591Medium· 5.9Hickory DNS 0.26.0-beta.1 before 0.26.2 DNSSEC Validation Bypass via Missing RFC 6840 Checks
CVE-2026-123595High· 8.8Hickory DNS through 0.26.0-alpha.1 DNSSEC Validation Bypass via Ancestor-Delegation NSEC3
CVE-2026-123594Medium· 4.8Hickory DNS through 0.26.0-alpha.1 DNSSEC NSEC Validation Bypass for Empty Non-Terminals
CVE-2026-123599Low· 3.7Hickory DNS before 0.26.0-beta.1 DNSSEC Validation Bypass via Non-IN Class Records