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

An attacker was able to perform an out-of-bounds read or write on a JavaScript Promise object. This vulnerability was fixed in Firefox 138.0.4, Firefox ESR 128.10.1, Firefox ESR 115.23.1, Thunderbird 128.10.2, and Thunderbird 138.0.2.

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.

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

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