Security researchers have announced that there is a new computer security bug that could put your information in danger.
It's called the Heartbleed Bug and it is a serious vulnerability in the popular OpenSSL cryptographic software library.
It is being described as one of the most serious security flaws uncovered in years and it could potentially affect millions of people.
Normally, when you see a lock icon on a website, you believe that it is safe.
That is not the case for computers infected by the heartbleed bug. Instead, it means that your passwords and credit card information and other personal information stored on your computer is accessible to hackers.
Software to fix the problem is being released on Monday. Until then, computer users are advised to stick to websites they trust.