CVE-2026-123570
📛 CVE Title
Hickory DNS from 0.18 before 0.26.2 Memory Amplification DoS via RR Counts
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.
Overview
- State
- PUBLISHED
- Assigner (CNA)
- VulnCheck
- CVSS severity
- HIGH
- CVSS score
- 8.7 / 10
- CVSS vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N- Effective score
- 8.7 / 10 HIGH source: CNA overview
- CWE(s)
-
CWE-400 - Reserved
- 2026-11-06
- Published
- 2026-11-08 01:38 UTC
- Last updated
- 2026-11-08 01:38 UTC
- Source
- https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/123xxx/CVE-2026-123570.json
- Linked Threat
- CVE-2026-123570 — Hickory DNS from 0.18 before 0.26.2 Memory Amplification DoS via RR Counts
European Union Vulnerability Database ENISA EUVD
ENISA's official EU repository for curated vulnerability intelligence. Carries a separate identifier (EUVD-YYYY-NNNN) and frequently exposes an earlier-published description + CVSS than NVD does.
- EUVD ID
-
EUVD-2026-119455
EUVD enrichment is queued; refresh the page in a few seconds.
Affected products (1)
| Vendor | Product | Versions | Platforms |
|---|---|---|---|
| hickory-dns | hickory-dns |
0.18 (affected),
0.26.2 (unaffected)
|
— |
Vendor references (2)
References embedded in the original CVE record by the assigning CNA.
- GitHub Security Advisory (GHSA-67wc-6jq8-ghrc) vendor-advisory
- VulnCheck Advisory: Hickory DNS from 0.18 before 0.26.2 Memory Amplification DoS via RR Counts third-party-advisory
MITRE references (2) cveawg.mitre.org
Pulled from MITRE's CVE Services API by the 🛰 Backfill from MITRE button.
- GitHub Security Advisory (GHSA-67wc-6jq8-ghrc) vendor-advisory
- VulnCheck Advisory: Hickory DNS from 0.18 before 0.26.2 Memory Amplification DoS via RR Counts third-party-advisory
Web references (0)
DuckDuckGo results ranked by threat-intel / vendor advisory domains. Generated by the 🔎 Find references (web) button above — same flow as the Remediations search.
No web references attached yet.
Remediations (10)
Remediations are stored against the linked Threat row; the list below is deduplicated across both pages.
-
web:arstechnica.com
Hackers have been exploiting a critical vulnerability in the Zimbra Collaboration Suite in an attempt to obtain email backups and authentication credentials of vulnerable organzations, Microsoft ...
2026-11-08 10:24 UTC -
web:cvedatabase.com
Search and analyze CVE vulnerabilities with instant access to CVSS scores, affected products, and remediation guidance.
2026-11-08 10:24 UTC -
web:docs.netscaler.com
NetScaler detects CVEs and provides remediation suggestions the same. This topic lists the remediations suggested for the following CVEs :
2026-11-08 10:24 UTC -
web:sec.cloudapps.cisco.com
As part of Cisco's ongoing commitment to proactive security and product quality, engineering teams conducted a comprehensive internal security review. This review resulted in software hardening releases that address multiple internally discovered vulnerabilities. These vulnerabilities were found during internal testing and are not known to be actively exploited. To assist customers in patching ...
2026-11-08 10:24 UTC -
web:www.bleepingcomputer.com
Today is Microsoft's October 2026 Patch Tuesday, with security updates addressing a record-breaking 1,411 flaws, including one actively exploited and two publicly disclosed zero-day vulnerabilities.
2026-11-08 10:24 UTC -
web:www.cisa.gov
CISA has updated this Alert to: (1) include CVE - 2026 -111357 and CVE - 2026 -118527 and reflect their addition to the Known Exploited Vulnerabilities (KEV) Catalog on October 30, 2026 ; and (2) update the affected Ivanti Connect Secure versions.
2026-11-08 10:24 UTC -
web:www.microsoft.com
From remediation to public disclosure CVE - 2026 -73570 is an unauthenticated OS command-injection vulnerability in the Zimbra Collaboration Suite SNMP notification path. An attacker can send a specially crafted SMTP request that introduces untrusted input into SNMP notification processing.
2026-11-08 10:24 UTC -
web:www.oracle.com
This Critical Patch Update contains 1448 new security patches across the product families listed below. Please note that a My Oracle Support (MOS) note summarizing the content of this Critical Patch Update and other Oracle Software Security Assurance activities is located at July 2026 Critical Patch Update: Executive Summary and Analysis.
2026-11-08 10:24 UTC -
web:www.oracle.com
Prior Critical Patch Update and Critical Security Patch Update advisories should be reviewed for information regarding earlier published security patches. Refer to Critical Patch Updates, Critical Security Patch Updates, Security Alerts and Bulletins for information about Oracle Security advisories.
2026-11-08 10:24 UTC -
web:www.runzero.com
Zimbra discloses critical unauthenticated RCE flaw CVE - 2026 -73570 (CVSS 8.9). Learn how SMTP snmp_notify exploits occur and upgrade to 10.1.20 immediately.
2026-11-08 10:24 UTC
AI Forensic Analysis
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Raw JSON
The full cvelistV5 record. Download as CVE-2026-123570.json.
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"packageURL": "pkg:cargo/hickory-proto",
"product": "hickory-dns",
"vendor": "hickory-dns",
"versions": [
{
"lessThan": "0.26.2",
"status": "affected",
"version": "0.18",
"versionType": "custom"
},
{
"status": "unaffected",
"version": "0.26.2",
"versionType": "semver"
}
]
}
],
"credits": [
{
"lang": "en",
"type": "reporter",
"value": "jpds"
}
],
"datePublic": "2026-09-03T00:00:00.000Z",
"descriptions": [
{
"lang": "en",
"value": "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."
}
],
"metrics": [
{
"cvssV4_0": {
"attackComplexity": "LOW",
"attackRequirements": "NONE",
"attackVector": "NETWORK",
"baseScore": 8.7,
"baseSeverity": "HIGH",
"privilegesRequired": "NONE",
"subAvailabilityImpact": "NONE",
"subConfidentialityImpact": "NONE",
"subIntegrityImpact": "NONE",
"userInteraction": "NONE",
"vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
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},
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"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
"format": "CVSS"
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-400",
"description": "Uncontrolled Resource Consumption",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-11-08T01:38:07.919Z",
"orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
"shortName": "VulnCheck"
},
"references": [
{
"name": "GitHub Security Advisory (GHSA-67wc-6jq8-ghrc)",
"tags": [
"vendor-advisory"
],
"url": "https://github.com/hickory-dns/hickory-dns/security/advisories/GHSA-67wc-6jq8-ghrc"
},
{
"name": "VulnCheck Advisory: Hickory DNS from 0.18 before 0.26.2 Memory Amplification DoS via RR Counts",
"tags": [
"third-party-advisory"
],
"url": "https://www.vulncheck.com/advisories/hickory-dns-from-0.18-before-0.26.2-memory-amplification-dos-via-rr-counts"
}
],
"title": "Hickory DNS from 0.18 before 0.26.2 Memory Amplification DoS via RR Counts",
"x_generator": {
"engine": "vulncheck-endgame"
}
}
},
"cveMetadata": {
"assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
"assignerShortName": "VulnCheck",
"cveId": "CVE-2026-123570",
"datePublished": "2026-11-08T01:38:07.919Z",
"dateReserved": "2026-11-06T00:53:14.313Z",
"dateUpdated": "2026-11-08T01:38:07.919Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}