CVE-2026-123595High· 8.8▾ TwilightHickory DNS hickory-proto 0.25 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 NSEC3 handler, which matches the closest encloser by hash alone without check…
▾ 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 0.25 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 NSEC3 handler, which matches the closest encloser by hash alone without checking the type bitmap and so accepts parent-side ancestor-delegation NSEC3 records as proof of nonexistence. An attacker who delivers one response built from genuinely signed parent NSEC3 records can cause NXDOMAIN or NODATA to be cached with AD=1, denying resolution of existing names at and below the zone cut.
hickory-dns >= 0.25 <= 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-2026-123596High· 8.8Hickory DNS through 0.26.0-alpha.1 DNSSEC Validation Bypass via Ancestor-Delegation NSEC
CVE-2026-123591Medium· 5.9Hickory DNS 0.26.0-beta.1 before 0.26.2 DNSSEC Validation Bypass via Missing RFC 6840 Checks
CVE-2026-123594Medium· 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