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.
[
{
"events": [
{
"introduced": "0"
},
{
"fixed": "115.21.0"
}
]
},
{
"events": [
{
"introduced": "0"
},
{
"fixed": "136.0"
}
]
},
{
"events": [
{
"introduced": "116.0"
},
{
"fixed": "128.8.0"
}
]
},
{
"events": [
{
"introduced": "0"
},
{
"fixed": "128.8"
}
]
},
{
"events": [
{
"introduced": "129.0"
},
{
"fixed": "136.0"
}
]
}
]
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2025-1933.json"