Regarding the bug reported about Cloudflare, a company which provides content delivery, security and other internet related services for websites:
The Zcash website (https://z.cash) is not affected.
The Zcash software ("MagicBean") is not affected.
As a precaution, in case some exchanges are affected, we recommend changing the password on any exchange accounts and also contacting support at those exchanges.
Here are some links for further reading on the Cloudflare bug:
Cloudflare incident report: https://blog.cloudflare.com/incident-report-on-memory-leak-caused-by-cloudflare-parser-bug
List of sites possibly affected by the bug: https://github.com/pirate/sites-using-cloudflare/blob/master/README.md