A difference in the handling of StructFields and ArrayTypes in WASM could be used to trigger an exploitable type confusion vulnerability. This vulnerability affects Firefox < 130, Firefox ESR < 128.2, and Thunderbird < 128.2.
https://www.mozilla.org/security/advisories/mfsa2024-43/
https://www.mozilla.org/security/advisories/mfsa2024-40/