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CVE-2026-123595— Hickory DNS through 0.26.0-alpha.1 DNSSEC Validation Bypass via Ancestor-Delegation NSEC3

Quick assessment

Affected
hickory-dns hickory-dns
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Hickory DNS 的 组件（版本 0.25 至 0.26.0-alpha.1）以及 组件（版本 0.26.0-beta.1 至 0.26.2 之前）存在一个 DNSSEC 验证漏洞。该漏洞位于验证递归解析器的 NSEC3 处理程序中：该程序仅通过哈希值匹配最近封闭者（closest encloser），而未检查类型位图（type bitmap），导致其错误地将父域侧的祖先委托（ancestor-delegation）NSEC3 记录视为不存在的证明。攻击者若利用真实签名的父域 NSEC3 记录构造响应，即可使

CVSS 8.8 · High

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-123595

Vulnerability Information
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Vulnerability Title
Hickory DNS through 0.26.0-alpha.1 DNSSEC Validation Bypass via Ancestor-Delegation NSEC3
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对数据真实性的验证不充分
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
hickory-dns hickory-dns 0.25 ~ 0.26.0-alpha.1 -
hickory-dns hickory-dns 0.26.0-beta.1 ~ 0.26.2 -

II. Public POCs for CVE-2026-123595

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III. Intelligence Information for CVE-2026-123595

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Other References for CVE-2026-123595 (2)

Same Patch Batch · hickory-dns · 2026-11-08 · 39 CVEs total

CVE-2026-123596 8.8 HIGH Hickory DNS through 0.26.0-alpha.1 DNSSEC Validation Bypass via Ancestor-Delegation NSEC
CVE-2026-123605 8.8 HIGH Hickory DNS through 0.25.0-alpha.3 DNSSEC Validation Bypass via RRSIG Signer's Name
CVE-2026-123570 7.5 HIGH Hickory DNS from 0.18 before 0.26.2 Memory Amplification DoS via RR Counts
CVE-2026-123572 7.5 HIGH Hickory-dns 0.20.1 before 0.26.2 Panic DoS via SVCB/HTTPS Zone Parser
CVE-2026-123575 7.5 HIGH Hickory DNS before 0.26.2 DoH Memory Exhaustion via Incomplete Request Bodies
CVE-2026-123571 7.5 HIGH Hickory DNS from 0.26.0 before 0.26.2 Panic via TSIG RDATA Decoding
CVE-2026-123577 7.5 HIGH Hickory DNS 0.24.0 before 0.26.2 DoH Unbounded Request Body Denial of Service
CVE-2026-123588 7.5 HIGH Hickory DNS Recursive Resolver Denial of Service via Cached Empty Connection Pool
CVE-2026-123574 7.5 HIGH Hickory DNS 0.24.0 before 0.26.2 Denial of Service via Zone File Parser
CVE-2026-123604 7.5 HIGH Hickory DNS 0.26.0-beta.1 before 0.26.2 Resource Exhaustion DoS via NameServerPool::try_se
CVE-2026-123576 7.5 HIGH Hickory DNS 0.24.0 through 0.26.1 Memory Exhaustion via DNS-over-QUIC Requests
CVE-2026-123573 7.5 HIGH hickory-dns from 0.20.1 before 0.26.2 Panic in SVCB/HTTPS Zone File Parser
CVE-2026-123606 7.5 HIGH Hickory-DNS Recursor 0.25.0-alpha.3 through 0.25.2 Glueless-NS Referral Amplification
CVE-2026-123607 7.5 HIGH Hickory DNS NSEC3 Closest-Encloser Proof Unbounded Loop Denial of Service
CVE-2026-123580 7.5 HIGH Hickory-DNS 0.26.0-beta.1 before 0.26.2 DNSSEC Nonexistence Proof Forgery via NSEC3
CVE-2026-123608 7.5 HIGH Hickory DNS hickory-proto 0.3.1 before 0.26.1 CPU Exhaustion via BinEncoder Name Compressi
CVE-2026-123586 7.5 HIGH Hickory DNS 0.25.0-alpha.3 through 0.25.2 Query Amplification via Cyclic Referrals
CVE-2026-123587 6.8 MEDIUM Hickory-DNS 0.26.0 before 0.26.2 DNSSEC Nonexistence Forgery via Wraparound NSEC
CVE-2026-123603 6.5 MEDIUM Hickory DNS Missing IPv4-Mapped IPv6 Canonicalization Access Control Bypass
CVE-2026-123601 6.5 MEDIUM Hickory DNS 0.26.0-beta.1 before 0.26.2 NSEC3 Proof of Nonexistence Forgery

Showing top 20 of 39 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: hickory-dns
Same vendor: hickory-dns
Same weakness: CWE-345