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cgi.parse_header doesn't work on headers that contain combinations of double quotes and semicolons (although it works with either type of character individually). 
>>> cgi.parse_header('form-data; name="files"; filename="fo\\"o;bar"')
('form-data', {'name': 'files', 'filename': '"fo\\"o'})
This issue is present in python 2.7 and 3.2. One solution is to change _parseparam as follows (same as email.message._parseparam):
def _parseparam(s):
 while s[:1] == ';':
 s = s[1:]
 end = s.find(';')
 while end > 0 and (s.count('"', 0, end) - s.count('\\"', 0, end)) % 2:
 end = s.find(';', end + 1)
 if end < 0:
 end = len(s)
 f = s[:end]
 yield f.strip()
 s = s[end:]