Vulnerability CVE-2013-7040

The page https://support.apple.com/en-us/HT205031 claims the vulnerability CVE-2013-7040 has been corrected by updating to Python 2.7.10. But since this vulnerability has not been corrected upstream I wonder how Apple corrected it?

when I run the script https://131002.net/siphash/poc.py which shows the vulnerability on my Mac with "El Capitan" and Python 2.7.10 it shows the problem seems to still be there:

mymac:Desktop user$ python --version
Python 2.7.10
mymac:Desktop user$ python -R poc.py
48 candidate solutions
Verified solutions for _Py_HashSecret:
2e6c631ab443a33b 00db6e2ed6d39408
ae6c631ab443a33b 80db6e2ed6d39408