High · published April 8, 2026
When verifying a certificate chain containing excluded DNS constraints, these constraints are not correctly applied to wildcard DNS SANs which use a different case than the constraint. This only affects validation of otherwise trusted certificate chains, issued by a root CA in the VerifyOptions.Roots CertPool, or in the system certificate pool.
| Product | Versions | Fixed in |
|---|---|---|
| golang/go | ≥ 1.26.0, < 1.26.2 | 1.26.2 |