CVE-2026-52686: Insufficient Verification of Data Authenticity in PowerDNS Recursor
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.
AI Analysis
Technical Summary
This vulnerability in PowerDNS Recursor allows a DNSSEC validation bypass due to acceptance of wildcard expansion proofs (NSEC/NSEC3 records) without signature validation when the wildcard answer is a CNAME or DNAME record. This flaw could potentially allow an attacker to provide unauthenticated DNS responses under these conditions. The affected versions include 5.2.0, 5.3.0, 5.4.0, and all versions from 5.2.0 up to but not including 5.2.12, from 5.3.0 up to but not including 5.3.9, and from 5.4.0 up to but not including 5.4.4. The CVSS v3.1 base score is 3.7, indicating low severity. No vendor advisory or patch information is provided, and no known exploits have been reported.
Potential Impact
The vulnerability allows bypassing DNSSEC validation under specific conditions involving wildcard DNS records with CNAME or DNAME answers. This could lead to acceptance of unauthenticated DNS data, potentially undermining DNS integrity and trust. However, the impact is limited as the CVSS score is low and no known exploits are reported.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Since no official fix or remediation level is provided, users should monitor PowerDNS advisories for updates. Until a patch is available, cautious deployment and monitoring of DNSSEC validation behavior are advised.
CVE-2026-52686: Insufficient Verification of Data Authenticity in PowerDNS Recursor
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.
CVSS v3.1
Score 3.7low
Affected software
pkg:github/pdns-recursorRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability in PowerDNS Recursor allows a DNSSEC validation bypass due to acceptance of wildcard expansion proofs (NSEC/NSEC3 records) without signature validation when the wildcard answer is a CNAME or DNAME record. This flaw could potentially allow an attacker to provide unauthenticated DNS responses under these conditions. The affected versions include 5.2.0, 5.3.0, 5.4.0, and all versions from 5.2.0 up to but not including 5.2.12, from 5.3.0 up to but not including 5.3.9, and from 5.4.0 up to but not including 5.4.4. The CVSS v3.1 base score is 3.7, indicating low severity. No vendor advisory or patch information is provided, and no known exploits have been reported.
Potential Impact
The vulnerability allows bypassing DNSSEC validation under specific conditions involving wildcard DNS records with CNAME or DNAME answers. This could lead to acceptance of unauthenticated DNS data, potentially undermining DNS integrity and trust. However, the impact is limited as the CVSS score is low and no known exploits are reported.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Since no official fix or remediation level is provided, users should monitor PowerDNS advisories for updates. Until a patch is available, cautious deployment and monitoring of DNSSEC validation behavior are advised.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- OX
- Date Reserved
- 2026-06-08T08:05:31.707Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a61d2cf9c2644c7f8b6a268
Added to database: 07/23/2026, 08:37:35 UTC
Last enriched: 07/23/2026, 08:52:32 UTC
Last updated: 09/05/2026, 10:52:10 UTC
Views: 98
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