This draft extends internet-draft-ietf-idr-rfc5575bis to cope with IPv6.
As mentioned in the Security Consideration section, no new security issues are added to the GBP protocol.

Note that, as mentioned in the security consideration section of the 5575bis draft, any relaxation of the validation procedure may allow unwanted Flow Specifications to be propagated, but this draft does not incur any such relaxation because the validation procedure remains the same.

Very minor editorial comment:

[Section 3.2]
the same as in Section 3.1 -> the same as in Section 3.1.