A use-after-free vulnerability can occur when the thread for a Web Worker is freed from memory prematurely instead of from memory in the main thread while cancelling fetch operations. This vulnerability affects Firefox < 58.
[
{
"product": "Firefox",
"vendor": "Mozilla",
"versions": [
{
"lessThan": "58",
"status": "affected",
"version": "unspecified",
"versionType": "custom"
}
]
}
]