On 64-bit CPUs, when the JIT compiles WASM i32 return values they can pick up bits from left over memory. This can potentially cause them to be treated as a different type. This vulnerability affects Firefox < 136, Firefox ESR < 115.21, Firefox ESR < 128.8, Thunderbird < 136, and Thunderbird < 128.8.
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"availability": "No subscription required",
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"binary_version": "136.0+build3-0ubuntu0.20.04.1",
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"availability": "No subscription required",
"binaries": [
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"binary_name": "thunderbird"
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"binary_name": "xul-ext-calendar-timezones"
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"binary_name": "xul-ext-gdata-provider"
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