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I do not think there should be references between the Python 2 docs and Python 3 docs. But within each, I think it ok to have exceptional multiple references for what is, I believe, a unique situation: a security fix that required a new feature. Do it however seems most graceful.
My first thought was that someone seeing "added in 2.6.8' should know that adding a feature in a bugfix release is almost never done, hence it might not be in 2.7.0. But then I remembered that this fix is mainly for web sites, and the reader selecting which Python versions to use might not be a Python programmer.