When using inst.ks=https//.....kickstart.ks on linux boot command to install nightly f26 from 20170430, I get a curl problem in dracut and the installation failed.

[   14.978841] dracut-initqueue[597]:   % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
[   14.979847] dracut-initqueue[597]:                                  Dload  Upload   Total   Spent    Left  Speed
  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
[   15.139411] dracut-initqueue[597]: curl: (77) Problem with the SSL CA cert (path? access rights?)
[   15.140469] dracut-initqueue[597]: Warning: failed to fetch kickstart from https://jskladan.fedorapeople.org/kickstarts/root-user-crypted-net.ks

Notes: 
Getting the kickstart using http is working fine.
When I do not use a kickstart, if I switch to anaconda console at the time I am asked to choose between text and vnc installation, then a curl on https is working fine.

Same tests on Fedora-26-20170429.n.0 works fine and it seems anaconda and dracut  have not changed since.