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CVE-2026-123590— Hickory DNS 0.26.0-beta.1 before 0.26.2 Improper NSEC/NSEC3 Signature Validation

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（0.26.0-beta.1 至 0.26.2 之前的版本）以及 hickory-proto 组件（0.26.0-alpha.1 及更早版本）存在安全漏洞：当存在同所有者名称且已通过签名验证的其他记录时，这些组件仍会接受用于 DNSSEC 不存在性证明的 NSEC 和 NSEC3 记录。能够注入 DNS 响应的攻击者可在权威部分将有效签名的记录与伪造的、同名称但类型不同的 NSEC 或 NSEC3 记录混合，从而伪造不存在性证明。

CVSS 4.8 · Medium 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-beta.1 before 0.26.2 Improper NSEC/NSEC3 Signature Validation

Source: CVE Program / CVE List V5

Vulnerability Description

Hickory DNS hickory-net 0.26.0-beta.1 before 0.26.2 and hickory-proto through 0.26.0-alpha.1 accept NSEC and NSEC3 records for DNSSEC nonexistence proofs when any other record with the same owner name passes signature validation. Attackers able to supply DNS responses can mix validly signed records with bogus same-name NSEC or NSEC3 records of different types in the authority section to forge nonexistence proofs.

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:L

Source: CVE Program / CVE List V5

Vulnerability Type

密码学签名的验证不恰当

Source: CVE Program / CVE List V5

Affected Products

Vendor	Product	Affected Versions	CPE	Subscribe
hickory-dns	hickory-dns	0.26.0-beta.1 ~ 0.26.2	-
hickory-dns	hickory-dns	0 ~ 0.26.0-alpha.1	-

II. Public POCs for CVE-2026-123590

#	POC Description	Source Link	Shenlong Link

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No public POC found.

III. Intelligence Information for CVE-2026-123590

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Other References for CVE-2026-123590 (2)

https://github.com/hickory-dns/hickory-dns/security/advisories/GHSA-57pw-897j-v4j6 vendor-advisory
https://www.vulncheck.com/advisories/hickory-dns-0.26.0-beta.1-before-0.26.2-improper-nsec-nsec3-signature-validation third-party-advisory

https://www.cve.org/CVERecord?id=CVE-2026-123590

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-2026-123596	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-2026-123575	7.5 HIGH	Hickory DNS before 0.26.2 DoH Memory Exhaustion via Incomplete Request Bodies
CVE-2026-123572	7.5 HIGH	Hickory-dns 0.20.1 before 0.26.2 Panic DoS via SVCB/HTTPS Zone Parser
CVE-2026-123577	7.5 HIGH	Hickory DNS 0.24.0 before 0.26.2 DoH Unbounded Request Body Denial of Service
CVE-2026-123571	7.5 HIGH	Hickory DNS from 0.26.0 before 0.26.2 Panic via TSIG RDATA Decoding
CVE-2026-123570	7.5 HIGH	Hickory DNS from 0.18 before 0.26.2 Memory Amplification DoS via RR Counts
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

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-347