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CVE-2026-0398— Crafted zones can lead to increased resource usage and crafted CNAME chains can lead to cache poisoning in Recursor

Quick assessment

Affected
PowerDNS Recursor
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.

PowerDNS Recursor（pdns_recursor）是荷兰PowerDNS公司的一款域名解析服务器。 PowerDNS Recursor存在安全漏洞，该漏洞源于特制区域可能导致资源使用增加，特制CNAME链可能导致缓存投毒。

CVSS 5.3 · Medium EPSS 0.32% · P23

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-0398

Vulnerability Information
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Vulnerability Title
Crafted zones can lead to increased resource usage and crafted CNAME chains can lead to cache poisoning in Recursor
Source: CVE Program / CVE List V5
Vulnerability Description
Crafted zones can lead to increased resource usage and crafted CNAME chains can lead to cache poisoning in Recursor.
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:L
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
PowerDNS Recursor（pdns_recursor） 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
PowerDNS Recursor（pdns_recursor）是荷兰PowerDNS公司的一款域名解析服务器。 PowerDNS Recursor存在安全漏洞，该漏洞源于特制区域可能导致资源使用增加，特制CNAME链可能导致缓存投毒。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
PowerDNS Recursor 5.3.0 ~ 5.3.5 -

II. Public POCs for CVE-2026-0398

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III. Intelligence Information for CVE-2026-0398

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Same Patch Batch · PowerDNS · 2026-02-09 · 4 CVEs total

CVE-2025-59023 8.2 HIGH Crafted delegations or IP fragments can poison cached delegations in Recursor
CVE-2025-59024 6.5 MEDIUM Crafted delegations or IP fragments can poison cached delegations in Recursor
CVE-2026-24027 5.3 MEDIUM Crafted zones can lead to increased incoming network traffic

IV. Related Vulnerabilities

Same product: Recursor
Same vendor: PowerDNS

V. Comments for CVE-2026-0398

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