CVE-2026-52686

Wildcard CNAME proof validation bypass

Low · published July 23, 2026

CVSS v3.1
3.7
EPSS
0%
Percentile
5.1
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
3.7 · LOW
Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
CVSS v4.0
Not supplied
EPSS
0.00162 · 5.1th percentile
Published
2026-07-23T08:03Z
EPSS history
Timeline
  • 23 JUL 08:03Z
    Wildcard CNAME proof validation bypass
    cvelistv5