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CVE-2026-123570— Hickory DNS from 0.18 before 0.26.2 Memory Amplification DoS via RR Counts

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 Hickory DNS 的 hickory-proto 组件中，版本 0.18 至 0.26.2（不含）的 DNS 线协议格式消息解析器存在漏洞：该解析器在读取记录数据之前，会依据不可信的报文头字段 ANCOUNT、NSCOUNT 和 ARCOUNT 预先分配相应大小的记录向量。远程攻击者可发送 UDP 数据报，或向客户端/解析器伪造响应，将这些计数值设置为 65535，从而强制每条消息分配约 18 MB 的内存。

CVSS 7.5 · High Updated Nov 08, 2026

Possible ATT&CK Techniques 2 AI

T1212 · Exploitation for Credential Access T1190 · Exploit Public-Facing Application

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Vulnerability Information

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Vulnerability Title

Hickory DNS from 0.18 before 0.26.2 Memory Amplification DoS via RR Counts

Source: CVE Program / CVE List V5

Vulnerability Description

The DNS wire-format message parser in hickory-proto (Hickory DNS) 0.18 before 0.26.2 preallocates record vectors sized by the untrusted ANCOUNT, NSCOUNT, and ARCOUNT header fields before reading record data. Remote attackers can send a UDP datagram, or a spoofed response to a client/resolver, with these counts set to 65535, forcing about 18MB of allocation per message.

Source: CVE Program / CVE List V5

CVSS Information

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

Source: CVE Program / CVE List V5

Vulnerability Type

未加控制的资源消耗(资源穷尽)

Source: CVE Program / CVE List V5

Affected Products

Vendor	Product	Affected Versions	CPE	Subscribe
hickory-dns	hickory-dns	0.18 ~ 0.26.2	-

II. Public POCs for CVE-2026-123570

#	POC Description	Source Link	Shenlong Link

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III. Intelligence Information for CVE-2026-123570

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Other References for CVE-2026-123570 (2)

https://github.com/hickory-dns/hickory-dns/security/advisories/GHSA-67wc-6jq8-ghrc vendor-advisory
https://www.vulncheck.com/advisories/hickory-dns-from-0.18-before-0.26.2-memory-amplification-dos-via-rr-counts third-party-advisory

https://www.cve.org/CVERecord?id=CVE-2026-123570

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-2026-123604	7.5 HIGH	Hickory DNS 0.26.0-beta.1 before 0.26.2 Resource Exhaustion DoS via NameServerPool::try_se
CVE-2026-123571	7.5 HIGH	Hickory DNS from 0.26.0 before 0.26.2 Panic via TSIG RDATA Decoding
CVE-2026-123580	7.5 HIGH	Hickory-DNS 0.26.0-beta.1 before 0.26.2 DNSSEC Nonexistence Proof Forgery via NSEC3
CVE-2026-123588	7.5 HIGH	Hickory DNS Recursive Resolver Denial of Service via Cached Empty Connection Pool
CVE-2026-123572	7.5 HIGH	Hickory-dns 0.20.1 before 0.26.2 Panic DoS via SVCB/HTTPS Zone Parser
CVE-2026-123574	7.5 HIGH	Hickory DNS 0.24.0 before 0.26.2 Denial of Service via Zone File Parser
CVE-2026-123575	7.5 HIGH	Hickory DNS before 0.26.2 DoH Memory Exhaustion via Incomplete Request Bodies
CVE-2026-123577	7.5 HIGH	Hickory DNS 0.24.0 before 0.26.2 DoH Unbounded Request Body Denial of Service
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
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-400