Leo KelionTechnology desk editor
BBC
A team of bug-hunters at Google have shared details of five flaws in Apple's iMessage software that could make its devices vulnerable to attack.
Another example, they said, could be used to copy files off a device without requiring the owner to do anything to aid the hack.
Apple released fixes last week.
But the researchers said they had also flagged a sixth problem to Apple, which had not been rectified in the update to its mobile operating system.
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"That's quite unusual," commented Prof Alan Woodward, a cyber-security expert at the University of Surrey.
"The reputation of the Google Zero team is such that it is worth taking notice of."
Urgent update
Apple has not commented on this specific issue, but has urged users to install the new version of iOS, which addresses Google's other discoveries as well as a further range of glitches and threats.
"Keeping your software up to date is one of the most important things you can do to maintain your Apple product's security," it said in a statement.
News site ZDnet - which was first to report the matter - noted that the level of detail shared by Google about the other bugs could be enough to let bad actors craft exploits to take advantage of them. Users should download iOS 12.4 "with no further delay," it added.
The synopsis of her talk also promises it will cover potential vulnerabilities in Apple's Visual Voicemail service - which allows users to select specific recordings - and its Mail app.
One of Apple's own security chiefs will also be attending the conference to give a separate presentation, which promises to go "behind the scenes of iOS and Mac security".