JIT miscompilation in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox 148 and Thunderbird 148.
PoC: CVE-2026-2796-escape-wasm-by-using-wasm
PoC exploit chain for CVE-2026-2796: SpiderMonkey WebAssembly sandbox escape (signature type confusion -> arbitrary R/W -> RCE)
PoC: CVE-2026-2796-and-CVE-2026-2768-escape-the-wasm-box
Full Firefox chain: CVE-2026-2796 wasm type confusion -> content-process RCE, plus CVE-2026-2768 parent-process escape analysis (both fixed in Firefox 148)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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