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CVE-2026-52690— Spoofed answers can mark an authoritative non-EDNS capable

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是PowerDNS公司开源的一款域名系统递归解析器。 PowerDNS Recursor 5.2.0版本至5.2.11之前版本、5.3.0版本至5.3.8之前版本和5.4.0版本至5.4.3之前版本存在授权问题漏洞，该漏洞源于Outgoing EDNS处理模块问题，可能导致伪造回复标记授权服务器的IP不支持EDNS，从而造成DNSSEC记录验证失败。

CVSS 5.9 · Medium EPSS 0.34% · P27

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 3

VendorProduct Version RangeStatus
PowerDNS Recursor 5.2.0< 5.2.11 affected
5.3.0< 5.3.8 affected
5.4.0< 5.4.3 affected
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I. Basic Information for CVE-2026-52690

Vulnerability Information
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Vulnerability Title
Spoofed answers can mark an authoritative non-EDNS capable
Source: CVE Program / CVE List V5
Vulnerability Description
Spoofing replies to Recursor might mark an IP of an authoritative server as not supporting EDNS, causing valdiation of DNSSEC records served by that server to fail.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
PowerDNS Recursor 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
PowerDNS recursor是PowerDNS公司开源的一款域名系统递归解析器。 PowerDNS Recursor 5.2.0版本至5.2.11之前版本、5.3.0版本至5.3.8之前版本和5.4.0版本至5.4.3之前版本存在授权问题漏洞，该漏洞源于Outgoing EDNS处理模块问题，可能导致伪造回复标记授权服务器的IP不支持EDNS，从而造成DNSSEC记录验证失败。
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 ~ 5.2.11 -

II. Public POCs for CVE-2026-52690

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III. Intelligence Information for CVE-2026-52690

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Vendor Advisories for CVE-2026-52690 (1)

Same Patch Batch · PowerDNS · 2026-06-25 · 14 CVEs total

CVE-2026-33612 7.5 HIGH ZoneToCache can poison the cache
CVE-2026-42387 5.9 MEDIUM Insufficient input validation in ZoneToCache
CVE-2026-42388 5.9 MEDIUM Missing input validation for catalog zones
CVE-2026-42390 5.3 MEDIUM ZONEMD validation can be bypassed
CVE-2026-42389 5.3 MEDIUM Reject more queries with invalid header values
CVE-2026-40209 5.3 MEDIUM Denial of service via IXFR queries
CVE-2026-40211 5.3 MEDIUM Denial of service via crafted DoH3 queries
CVE-2026-40012 5.3 MEDIUM Information about ECS zero scoped answers might leak to clients that use a specific ECS
CVE-2026-40210 4.8 MEDIUM Out-of-bounds read in SetMacAddrAction
CVE-2026-42005 4.3 MEDIUM Insufficient input validation of internal web server
CVE-2026-42004 3.7 LOW EDNS options smuggling
CVE-2026-40011 3.7 LOW Prometheus denial of service via crafted DNS queries
CVE-2026-40208 3.7 LOW Denial of service via DoH3 queries

IV. Related Vulnerabilities

Same product: Recursor
Same vendor: PowerDNS

V. Comments for CVE-2026-52690

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