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CVE-2026-52684— Prefetch Feature Allows Persistent Ghost Domain Cache Poisoning Attack

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是PowerDNS公司开源的一款开源DNS服务器。PowerDNS在Win32下使用 Access的mdb文件记录DNS信息,而在Linux/Unix下则使用MySQL来记录DNS信息。无论是mdb亦或MySQL,备份是非常方便的事情。 PowerDNS 5.5.0之前版本存在安全漏洞，该漏洞源于TTL上限未强制执行，可能导致认证服务器响应缓慢且记录在中间过期时缺乏数据。

CVSS 3.7 · Low EPSS 0.22% · P12

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
PowerDNS Recursor 0.0.0< 5.5.0 affected
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I. Basic Information for CVE-2026-52684

Vulnerability Information
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Vulnerability Title
Prefetch Feature Allows Persistent Ghost Domain Cache Poisoning Attack
Source: CVE Program / CVE List V5
Vulnerability Description
If the auth responds very slowly and the records expire in between, the capping of TTLs is not enforced for lack of data. This does not happen on regular resolve as then then the child records are used immediately if not expired and thus valid, or the records are expired, and in that case not used. So this case can only happen if almost expired records are used to refresh the authoritative NS 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:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
PowerDNS 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
powerdns是PowerDNS公司开源的一款开源DNS服务器。PowerDNS在Win32下使用 Access的mdb文件记录DNS信息,而在Linux/Unix下则使用MySQL来记录DNS信息。无论是mdb亦或MySQL,备份是非常方便的事情。 PowerDNS 5.5.0之前版本存在安全漏洞，该漏洞源于TTL上限未强制执行，可能导致认证服务器响应缓慢且记录在中间过期时缺乏数据。
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 0.0.0 ~ 5.5.0 -

II. Public POCs for CVE-2026-52684

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III. Intelligence Information for CVE-2026-52684

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Patches & Fixes for CVE-2026-52684 (1)

Same Patch Batch · PowerDNS · 2026-07-23 · 3 CVEs total

CVE-2026-52688 7.5 HIGH RRSIGs with too few labels can lead to bypass of DNSSEC wildcard validation
CVE-2026-52686 3.7 LOW Wildcard CNAME proof validation bypass

IV. Related Vulnerabilities

Same product: Recursor
Same vendor: PowerDNS

V. Comments for CVE-2026-52684

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