What is CVE-2026-52688?

CVE-2026-52688 is a high-severity vulnerability in Powerdns Recursor, classified under Improper Certificate Validation. CVSS score: 7.5/10. Published 2026-07-23.

How severe is CVE-2026-52688?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Powerdns Recursor

CVE-2026-52688

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

Vulnerability class: Improper Certificate Validation

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.

Affected products

Powerdns Recursor — versions 5.2.0, 5.3.0, 5.4.0

Weakness classification (CWE)

CWE-295 — Improper Certificate Validation
CWE-345 — Insufficient Verification of Data Authenticity

References

security@open-xchange.com

Frequently asked questions

What is CVE-2026-52688?: CVE-2026-52688 is a high-severity vulnerability in Powerdns Recursor, classified under Improper Certificate Validation. CVSS score: 7.5/10. Published 2026-07-23.
How severe is CVE-2026-52688?: High severity. CVSS v3 base score is 7.5 out of 10.