PT-2026-63587 · Powerdns · Recursor

Qifan Zhang · CVE-2026-52686 · Published 2026-07-23 · Updated 2026-07-23

NVD

CVSS v3.1

3.7

Low

Base vector

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

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.

Fix

Improper Verification of Cryptographic Signature

Weakness Enumeration

CWE-347

Related Identifiers

CVE-2026-52686

Affected Products

Recursor

References · 3

• https://nvd.nist.gov/vuln/detail/CVE-2026-52686 · Security Note
• https://docs.powerdns.com/recursor/security-advisories/powerdns-advisory-powerdns-2026-10.html · Note
• https://reddit.com/r/Ubuntu/comments/1v4e24u/securityubuntucom_security_api_downtime · Reddit Post