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If both the CA and the client software follow the RFC, the client software will refuse the cert. Section 4.2 (Certificate Extensions) of the RFC you link states ... Each extension in a certific...
Answer
#1: Initial revision
If both the CA and the client software follow the RFC, the client software will refuse the cert. Section 4.2 (Certificate Extensions) of the RFC you link states > ... Each extension in a certificate is designated as either critical or non-critical. A certificate-using system MUST reject the certificate if it encounters a critical extension it does not recognize or a critical extension that contains information that it cannot process. A non-critical extension MAY be ignored if it is not recognized, but MUST be processed if it is recognized. ... And section 4.2.1.10 (Name Constraints) states > ... Conforming CAs MUST mark this extension as critical ...