PT-2026-31068 · Go Standard Library · Crypto/X509

1Seal + 2 · Published 2026-04-08 · Updated 2026-04-08 · CVE-2026-33810

Mitre

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.

Related Identifiers

CVE-2026-33810

Affected Products

Crypto/X509

References · 5

• https://nvd.nist.gov/vuln/detail/CVE-2026-33810 · Security Note
• https://go.dev/cl/763763 · Note
• https://groups.google.com/g/golang-announce/c/0uYbvbPZRWU · Note
• https://go.dev/issue/78332 · Note
• https://pkg.go.dev/vuln/GO-2026-4866 · Note