This was a certificate fail on the CloudFlare side on the Imgur account hosted on our behalf. We're still awaiting info on what exactly happened, but since it's not directly our account we may not get this information.
The fix should be rolling out shortly around the world - we prodded both sides to have new certs issues ASAP and we are now seeing valid certificates in most locations (our New York sysamins aren't seeing it yet).
New cert details
- Valid From: Tuesday, October 27, 2015 at 8:00:00 PM EDT
- Valid To: Thursday, October 27, 2016 at 7:59:59 PM EDT
96 BD DF 71 49 F8 C6 D9 A8 6E 2D E1 D3 5D 2F 00 6A 90 0C ED
90 13 A3 FD B5 61 F4 B5 E9 8D DC 8B D7 9D BE C5
- SAN entries: