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CVE-2026-123578— Hickory DNS 0.26.0 before 0.26.2 Response Validation Bypass via QDCOUNT=0

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 hickory-net 组件在 0.26.0 至 0.26.2 之前的版本，以及 hickory-proto 组件在 0.25.0 至 0.25.2 版本中，当 UDP 响应的问题区（question section）为空（即 QDCOUNT=0）时，会跳过对“响应中的问题区是否与查询匹配”的检查，同时也跳过了 case-randomization（大小写随机化）检查。能够注入伪造 UDP 响应的远程攻击者可发送 QDCOUNT=0 的响应来绕过这些验证机制，从而削弱针对 DNS 欺骗攻

CVSS 3.7 · Low Updated Nov 08, 2026

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

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Vulnerability Information

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Vulnerability Title

Hickory DNS 0.26.0 before 0.26.2 Response Validation Bypass via QDCOUNT=0

Source: CVE Program / CVE List V5

Vulnerability Description

Hickory DNS hickory-net 0.26.0 before 0.26.2 and hickory-proto 0.25.0 through 0.25.2 skip the check that a UDP response's question section matches the query when the response has an empty question section (QDCOUNT=0), and also skip the case-randomization check. Remote attackers able to inject spoofed UDP responses can send QDCOUNT=0 responses to bypass these checks, weakening defenses against DNS spoofing.

Source: CVE Program / CVE List V5

CVSS Information

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N

Source: CVE Program / CVE List V5

Vulnerability Type

使用欺骗进行的认证绕过

Source: CVE Program / CVE List V5

Affected Products

Vendor	Product	Affected Versions	CPE	Subscribe
hickory-dns	hickory-dns	0.26.0 ~ 0.26.2	-
hickory-dns	hickory-dns	0.25.0 ~ 0.25.2	-

II. Public POCs for CVE-2026-123578

#	POC Description	Source Link	Shenlong Link

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III. Intelligence Information for CVE-2026-123578

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Other References for CVE-2026-123578 (2)

https://github.com/hickory-dns/hickory-dns/security/advisories/GHSA-3w89-7rx5-hpwx vendor-advisory
https://www.vulncheck.com/advisories/hickory-dns-0.26.0-before-0.26.2-response-validation-bypass-via-qdcount-0 third-party-advisory

https://www.cve.org/CVERecord?id=CVE-2026-123578

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

CVE-2026-123595	8.8 HIGH	Hickory DNS through 0.26.0-alpha.1 DNSSEC Validation Bypass via Ancestor-Delegation NSEC3
CVE-2026-123605	8.8 HIGH	Hickory DNS through 0.25.0-alpha.3 DNSSEC Validation Bypass via RRSIG Signer's Name
CVE-2026-123596	8.8 HIGH	Hickory DNS through 0.26.0-alpha.1 DNSSEC Validation Bypass via Ancestor-Delegation NSEC
CVE-2026-123570	7.5 HIGH	Hickory DNS from 0.18 before 0.26.2 Memory Amplification DoS via RR Counts
CVE-2026-123580	7.5 HIGH	Hickory-DNS 0.26.0-beta.1 before 0.26.2 DNSSEC Nonexistence Proof Forgery via NSEC3
CVE-2026-123571	7.5 HIGH	Hickory DNS from 0.26.0 before 0.26.2 Panic via TSIG RDATA Decoding
CVE-2026-123572	7.5 HIGH	Hickory-dns 0.20.1 before 0.26.2 Panic DoS via SVCB/HTTPS Zone Parser
CVE-2026-123588	7.5 HIGH	Hickory DNS Recursive Resolver Denial of Service via Cached Empty Connection Pool
CVE-2026-123575	7.5 HIGH	Hickory DNS before 0.26.2 DoH Memory Exhaustion via Incomplete Request Bodies
CVE-2026-123574	7.5 HIGH	Hickory DNS 0.24.0 before 0.26.2 Denial of Service via Zone File Parser
CVE-2026-123577	7.5 HIGH	Hickory DNS 0.24.0 before 0.26.2 DoH Unbounded Request Body Denial of Service
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-2026-123607	7.5 HIGH	Hickory DNS NSEC3 Closest-Encloser Proof Unbounded Loop Denial of Service
CVE-2026-123606	7.5 HIGH	Hickory-DNS Recursor 0.25.0-alpha.3 through 0.25.2 Glueless-NS Referral Amplification
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-2026-123601	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-290