An attacker was able to achieve code execution in the content process by exploiting a use-after-free in Animation timelines. We have had reports of this vulnerability being exploited in the wild.

An attacker was able to perform an out-of-bounds read or write on a JavaScript Promise object. This vulnerability affects Firefox ESR < 115.23.1.

An attacker was able to perform an out-of-bounds read or write on a JavaScript object by confusing array index sizes.

Chromium: CVE-2023-4863 Heap buffer overflow in WebP

Chromium: CVE-2023-5217 Heap buffer overflow in vp8 encoding in libvpx