What is CVE-2026-52686?

CVE-2026-52686 is a low-severity vulnerability in Powerdns Recursor, classified under Improper Verification of Cryptographic Signature. CVSS score: 3.7/10. Published 2026-07-23.

How severe is CVE-2026-52686?

Low severity. CVSS v3 base score is 3.7 out of 10.

Vulnerability in Powerdns Recursor

CVE-2026-52686

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 metric

CVSS v3 base score 3.7 (Low). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N.

Affected products

Powerdns Recursor — versions 5.2.0, 5.3.0, 5.4.0

Weakness classification (CWE)

CWE-347 — Improper Verification of Cryptographic Signature

References

security@open-xchange.com

Frequently asked questions

What is CVE-2026-52686?: CVE-2026-52686 is a low-severity vulnerability in Powerdns Recursor, classified under Improper Verification of Cryptographic Signature. CVSS score: 3.7/10. Published 2026-07-23.
How severe is CVE-2026-52686?: Low severity. CVSS v3 base score is 3.7 out of 10.