(Please test and, if you encounter the problem, upvote to get this bug reopened.)
The issue has been marked as "closed/withdrawn/cannot reproduce", but I am encountering the bug on the latest versions of both ColdFusion 9 & 10. It doesn't matter which format the column/cell is in. I've tried both "general" and "text".
Here's simple spreadsheet sample data that will cause ColdFusion to throw an error:
In some cases, the column is non-essential and it'd be ok to identify the column & remove it from the spreadsheet, but this can't apparently be done without first successfully reading the spreadsheet.