CVE-2026-52686

LOW 3.7

Wildcard CNAME proof validation bypass

CVSS Score

3.7

EPSS Score

0.0%

EPSS Percentile

0th

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.

Vendor	powerdns
Product	recursor
Published	Jul 23, 2026

Stay Ahead of the Next One

Get instant alerts for powerdns recursor

Be the first to know when new low vulnerabilities affecting powerdns recursor are published — delivered to Slack, Telegram or Discord.

Get Free Alerts → Free · No credit card · 60 sec setup

CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

Low

Availability

None

Affected Versions

PowerDNS / Recursor

5.2.0 < 5.2.12 5.3.0 < 5.3.9 5.4.0 < 5.4.4

References

NVD ↗ CVE.org ↗ EPSS Data ↗

docs.powerdns.com: https://docs.powerdns.com/recursor/security-advisories/powerdns-advisory-powerdns-2026-10.html

Credits

Qifan Zhang from Palo Alto Networks