CVE-2026-33810 | 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.
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.
- 🔗 go.dev/cl/763763
- 🔗 go.dev/issue/78332
- 🔗 groups.google.com/g/golang-announce/c/0uYbvbPZRWU
- 🔗 pkg.go.dev/vuln/GO-2026-4866
- 🔗 www.openwall.com/lists/oss-security/2026/04/19/4
- 🔗 www.openwall.com/lists/oss-security/2026/04/20/1
- 🔗 access.redhat.com/errata/RHSA-2026:10155
- 🔗 access.redhat.com/errata/RHSA-2026:10158
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CVE-2026-33810 | 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.
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 certi