The first of the two flaws, CVE-2019-9810, consists of incorrect alias information when using the Array.prototype.slice method, which could result in a missing bound check and buffer overflow. The second issue, CVE-2019-9813, is described as the mishandling of __proto__ mutations of, which can lead to type confusion in IonMonkey JIT code, allowing for arbitrary memory read and write.
Researchers Richard Zhu and Amat Cama of Trend Micro's Zero Day Initiative are credited with discovering the first vulnerability, while Niklas Baumstark, also with Trend Micro's Zero Day Initiative, found the second problem.
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