What’s Vulnerable › Vulnerabilities

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

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-23 · updated 2026-10-24
• Weakness: CWE-295

Description

RRSIGs with too few labels can lead to bypass of DNSSEC wildcard validation

Affected products

• PowerDNS Recursor: from 5.2.0 before 5.2.12; from 5.3.0 before 5.3.9; from 5.4.0 before 5.4.4 — fixed in 5.2.12, 5.3.9, 5.4.4

How to fix

Upgrade to a fixed version: PowerDNS Recursor 5.2.12, 5.3.9, 5.4.4. Check the vendor advisory for mitigations.

References

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

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