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CVE-2026-52686— Wildcard CNAME proof validation bypass

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 5.2.0版本至5.2.12之前版本、5.3.0版本至5.3.9之前版本和5.4.0版本至5.4.4之前版本存在安全漏洞，该漏洞源于DNSSEC验证绕过，当通配符答案为CNAME或DNAME记录时，通配符扩展证据（NSEC/NSEC3记录

CVSS 3.7 · Low EPSS 0.16% · P5

Affected Version Matrix 3

VendorProduct Version RangeStatus
PowerDNS Recursor 5.2.0< 5.2.12 affected
5.3.0< 5.3.9 affected
5.4.0< 5.4.4 affected
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I. Basic Information for CVE-2026-52686

Vulnerability Information
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Vulnerability Title
Wildcard CNAME proof validation bypass
Source: CVE Program / CVE List V5
Vulnerability Description
The issue is a DNSSEC validation bypass where wildcard expansion proofs (NSEC/NSEC3 records) are accepted without signature validation when the wildcard answer is a CNAME or DNAME record.
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 5.2.0版本至5.2.12之前版本、5.3.0版本至5.3.9之前版本和5.4.0版本至5.4.4之前版本存在安全漏洞，该漏洞源于DNSSEC验证绕过，当通配符答案为CNAME或DNAME记录时，通配符扩展证据（NSEC/NSEC3记录
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 5.2.0 ~ 5.2.12 -

II. Public POCs for CVE-2026-52686

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III. Intelligence Information for CVE-2026-52686

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Other References for CVE-2026-52686 (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-2026-52684 3.7 LOW Prefetch Feature Allows Persistent Ghost Domain Cache Poisoning Attack

IV. Related Vulnerabilities

Same product: Recursor
Same vendor: PowerDNS

V. Comments for CVE-2026-52686

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