is there a safe marshaler?

[Irmen de Jong]

Pickle and marshal are not safe. They can do harmful
things if fed maliciously constructed data.
That is a pity, because marshal is fast.
I need a fast and safe (secure) marshaler.
Is xdrlib the only option?
I would expect that it is fast and safe because
it (the xdr spec) has been around for so long.

Or are there better options (perhaps 3rd party libraries)?

Thanks

Irmen.