On its website, the tech giant wrote that WebKit was impacted: a browser engine that is primarily used in Apple's Safari web browser.
"Processing maliciously crafted web content may lead to arbitrary code execution," Apple said. "Apple is aware of a report that this issue may have been actively exploited."
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NEW YORK, NEW YORK - FEBRUARY 03: A person walks near Apple Store on February 03, 2023, in New York City. ((Photo by Leonardo Munoz/VIEWpress))
"A type confusion issue was addressed with improved checks," Apple said of the latest security update.
The update is available for iPhone 8 model and later, all models of the iPad Pro, the third-generation iPad Air and later, the fifth-generation iPad Air and later and the fifth-generation iPad mini and later.
An iPhone with privacy and security settings is seen in this photo illustration in Warsaw, Poland, on January 5, 2022. ((Photo by Jaap Arriens/NurPhoto via Getty Images))
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It also addresses another security issue in the iPhone's Kernel framework.
An Apple logo hangs inside their retail store on Broadway on Jan. 10, 2023, in New York City. (Gary Hershorn/Getty Images)
"An app may be able to execute arbitrary code with kernel privileges," Apple explained.
The iOS 16.3.1 update comes just weeks after the release of iOS 16.3.