description: Incorrect handling of __proto__ mutations may lead to type confusion in IonMonkey JIT code and can be leveraged for arbitrary memory read and write. This vulnerability affects Firefox < 66.0.1, Firefox ESR < 60.6.1, and Thunderbird < 60.6.1.
problem types: Ionmonkey type confusion with __proto__ mutations
affected:
{
product: Firefox
vendor: Mozilla
versions:
lessThan: 66.0.1, status: affected, version: unspecified, versionType: custom
}
{
product: Firefox ESR
vendor: Mozilla
versions:
lessThan: 60.6.1, status: affected, version: unspecified, versionType: custom
}
{
product: Thunderbird
vendor: Mozilla
versions:
lessThan: 60.6.1, status: affected, version: unspecified, versionType: custom
}
