The tech giants have been forced to disable the Walkie-Talkie app on their smart watches, because of a flaw that allowed users to listen to voice messages sent to another person's phone.
The app let two people who had accepted an invitation send and receive short audio messages, but according to the BBC, Apple said it had been "made aware" of a fault that "could allow somebody to listen through another customer's iPhone without consent".
Apple has now disabled the feature and apologised for the inconvenience, however the company insists they are not aware of the Walkie-Talkie bug being exploited by anybody in the real world.
It said "specific conditions and sequences of events" would be required to exploit the bug, and they don't believe there were any cases of this happening outside of their own testing.
The news comes after Apple found a similar eavesdropping flaw in its FaceTime video-calling app back in January, when some users were able to activate the microphone on a target iPhone even if the recipient did not answer their call.
To fix the bug, Apple issued a software update.
As of the time of writing, it's not known whether Apple intend on fixing the bug in the Walkie-Talkie app, or if it will be discontinued forever.