Millions of android devices are still vulnerable to the Heartbleed bug.
Google announced that any mobiles and tablets using its 4.1.1 mobile operating system are at risk. This puts users at risk of potentially having sensitive data stolen.
Security firms have also warned that other mobile apps could also be at risk, including Blackberry's instant messaging software for IOS and Android.
Some owners of the devices can protect themselves by upgrading Android to a more recent version.
Users with a HTC device however are unable to update any higher than the 4.1.1 software.
HTC said: "Privacy and security are important to HTC and we are committed to helping safeguard our customers' devices and data.
"We're currently working to implement the security patch issued by Google this week to the small number of older devices that are on Android 4.1.1."
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