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CVE-2026-52688— RRSIGs with too few labels can lead to bypass of DNSSEC wildcard validation

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 5.2.12之前版本、5.3.9之前版本和5.4.4之前版本存在安全漏洞，该漏洞源于RRSIGs标签数量过少，可能导致绕过DNSSEC通配符验证。

CVSS 7.5 · High EPSS 0.18% · P7

Possible ATT&CK Techniques 1 AI

T1557 · Adversary-in-the-Middle

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-2026-52688

Vulnerability Information
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Vulnerability Title
RRSIGs with too few labels can lead to bypass of DNSSEC wildcard validation
Source: CVE Program / CVE List V5
Vulnerability Description
RRSIGs with too few labels can lead to bypass of DNSSEC wildcard validation
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/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 5.2.12之前版本、5.3.9之前版本和5.4.4之前版本存在安全漏洞，该漏洞源于RRSIGs标签数量过少，可能导致绕过DNSSEC通配符验证。
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-2026-52688

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III. Intelligence Information for CVE-2026-52688

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Other References for CVE-2026-52688 (1)

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

CVE-2026-52684 3.7 LOW Prefetch Feature Allows Persistent Ghost Domain Cache Poisoning Attack
CVE-2026-52686 3.7 LOW Wildcard CNAME proof validation bypass

IV. Related Vulnerabilities

Same product: Recursor
Same vendor: PowerDNS

V. Comments for CVE-2026-52688

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