The Mozilla Foundation yesterday issued a security update for its Thunderbird open-source email client, fixing two critical vulnerabilities involving its IonMonkey JavaScript JIT (just-in-time) compiler. 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.
Source: SC Magazine
