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CVE-2026-123591— Hickory DNS 0.26.0-beta.1 before 0.26.2 DNSSEC Validation Bypass via Missing RFC 6840 Checks

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.

在版本 0.26.2 之前的 Hickory DNS hickory-net（0.26.0-beta.1 及更早版本）以及 hickory-proto（0.26.0-alpha.1 及更早版本）中，未能按照 RFC 6840 第 4.4 节的要求，验证用于否定 DS RRset 的 NSEC 或 NSEC3 记录是否同时也证明了该委托的 NS 记录存在。攻击者可利用子域侧的 NSEC 或 NSEC3 记录伪造不安全的委托，进而伪造子域记录。

CVSS 5.9 · Medium Updated Nov 08, 2026

Possible ATT&CK Techniques 2 AI

T1059 · Command and Scripting Interpreter T1071.004 · DNS

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Vulnerability Information

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Vulnerability Title

Hickory DNS 0.26.0-beta.1 before 0.26.2 DNSSEC Validation Bypass via Missing RFC 6840 Checks

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 fail to verify, per RFC 6840 §4.4, that an NSEC or NSEC3 record denying a DS RRset also proves the delegation's NS record exists. Attackers can reuse child-side NSEC or NSEC3 records to fake an insecure delegation and forge child-zone records.

Source: CVE Program / CVE List V5

CVSS Information

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

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	0.26.0-beta.1 ~ 0.26.2	-
hickory-dns	hickory-dns	0 ~ 0.26.0-alpha.1	-

II. Public POCs for CVE-2026-123591

#	POC Description	Source Link	Shenlong Link

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III. Intelligence Information for CVE-2026-123591

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Other References for CVE-2026-123591 (2)

https://github.com/hickory-dns/hickory-dns/security/advisories/GHSA-7php-9j59-g3ch vendor-advisory
https://www.vulncheck.com/advisories/hickory-dns-0.26.0-beta.1-before-0.26.2-dnssec-validation-bypass-via-missing-rfc-6840-checks third-party-advisory

https://www.cve.org/CVERecord?id=CVE-2026-123591

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

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-2026-123595	8.8 HIGH	Hickory DNS through 0.26.0-alpha.1 DNSSEC Validation Bypass via Ancestor-Delegation NSEC3
CVE-2026-123586	7.5 HIGH	Hickory DNS 0.25.0-alpha.3 through 0.25.2 Query Amplification via Cyclic Referrals
CVE-2026-123606	7.5 HIGH	Hickory-DNS Recursor 0.25.0-alpha.3 through 0.25.2 Glueless-NS Referral Amplification
CVE-2026-123573	7.5 HIGH	hickory-dns from 0.20.1 before 0.26.2 Panic in SVCB/HTTPS Zone File Parser
CVE-2026-123576	7.5 HIGH	Hickory DNS 0.24.0 through 0.26.1 Memory Exhaustion via DNS-over-QUIC Requests
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-2026-123570	7.5 HIGH	Hickory DNS from 0.18 before 0.26.2 Memory Amplification DoS via RR Counts
CVE-2026-123577	7.5 HIGH	Hickory DNS 0.24.0 before 0.26.2 DoH Unbounded Request Body Denial of Service
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-2026-123571	7.5 HIGH	Hickory DNS from 0.26.0 before 0.26.2 Panic via TSIG RDATA Decoding
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-2026-123580	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-2026-123607	7.5 HIGH	Hickory DNS NSEC3 Closest-Encloser Proof Unbounded Loop Denial of Service
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-345