More info on issue:
Just scanned my Mac ...besides OS there is HomeBrew and MAMP
CentOS 7 server (yeah, I know): only python2
Above link did say to fix/patch as 'normal' and ASAP.
For others who might be reading this .... DON'T PANIC!
And, if php curl not needed for moodle to function, one could temp disable loading of curl extension via ini file.
'SoS', Ken