I'm not aware of a production CX bike designed for 26" wheels. You might keep looking down the touring path though, since several companies make 26" touring bikes. That's not this sub-forum, though.
If you're willing to build your own bike, find a 26" wheeled mountain frame with a rigid fork. Craigslist is your friend here, as you peruse the dozens of mid-90s Speshy Hardrocks, Trek 820s, and GT's available. Then, spec it out yourself, using this
as your guide. I did the same thing to get my start racing, and though it was ridiculously heavy, it was also ridiculously fun, and very unique.
Consider though, that like goofy has stated, there are a lot more CX type tires available for 700c wheels than for 26" (Schwalbe, Kenda, and Club Roost make 26" narrow knobby tires, that's all I'm aware of.). If you'd like to move up to 1.9 or 2 inch tires, your options increase greatly, but you're really riding a drop bar MTB in that case. Not all that bad, probably still a lot of fun, just not really a CX bike.