Two major vulnerabilities have been discovered in Google's Android mobile software by the same security company that found a whole series of dangerous bugs earlier this year. Several of the bugs discovered by the security researchers pose a danger to every active Android device out there.

The two new bugs, which can expose people with Android-powered smartphones and tablets to attacks by malicious hackers, are the latest in a "library" of vulnerabilities that have come to be known as Stagefright. Zimperium zLabs initially discovered this class of vulnerabilities in April, but has now found the problem is broader than originally thought.

The vulnerability affects more than half of all Android devices. It has not been a great week for Android. Just days after a new branded bug was disclosed in the widely popular mobile software, a new vulnerability threatens to render most Android devices unresponsive to basic tasks.

Discovered by Trend Micro researchers, the security flaw once triggered can put affected devices in a coma-like state, which includes preventing affected phones from making or receiving calls. An attacker can exploit a flaw through either a malicious app, which the researcher said could have long-term effects on the device, such as crashing the device every time it is turned on.

A security research company claims to have found a vulnerability baked into Android that could endanger nearly all devices running the popular mobile software. The flaw exists in the media playback tool built into Android.

Malicious hackers could take advantage of it by sending to an Android device a simple text message that, once received by the smartphone, would give them complete control over the handset and allow them to steal anything on it, such as credit card numbers or personal information. The flaw has not been exploited, but in a blog post on its own website, it said that Android devices worldwide are vulnerable.