UserAgent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/57.0.2987.133 Safari/537.36

Steps to reproduce the problem:
1. Have a fresh Fedora 24/25/[26 Alpha] install
2. Install Chrome rpm
3. Visit https://pinning-test.badssl.com/
4. The site is presented without warning

What is the expected behavior?
The user is presented with a NET::ERR_SSL_PINNED_KEY_NOT_IN_CERT_CHAIN warning.

What went wrong?
I believe the way root CAs are handled by Fedora is different from the way Ubuntu handles them, thus the detection code for custom CAs doesn't work. There is ongoing discussion of this bug here:

https://bugzilla.redhat.com/show_bug.cgi?id=1207335

If someone from Google could lend a hand with diagnosing the bug, I'm sure the folks at Red Hat would appreciate it.

Chrome->Developer tools->Security says

Public-Key Pinning Bypassed
Public-key pinning was bypassed by a local root certificate.

Did this work before? No 

Chrome version: 57.0.2987.133  Channel: stable
OS Version: Fedora 24/25/26
Flash Version: 

This is really a Fedora bug, but it would be useful if ya'll could help them diagnose the problem so your users on Fedora would be protected.