The HandBrake development team posted a security warning on the project's website and support forum on Saturday, alerting Mac users who downloaded and installed the program from May 2 to May 6 to check their computers for malware.

The attackers compromised only a download mirror hosted under download.handbrake.fr, with the primary download server remaining unaffected. Because of this, users who downloaded HandBrake-1.0.7.dmg during the period in question have a 50/50 chance of having received a malicious version of the file, the HandBreak team said.

Users of HandBrake 1.0 and later who upgraded to version 1.0.7 through the program's built-in update mechanism shouldn't be affected, because the updater verifies the program's digital signature and wouldn't have accepted the malicious file.

Users of version 0.10.5 and earlier who used the built-in updater and all users who downloaded the program manually during those five days might be affected, so they should check their systems.

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