The aeson library is not safe to use to consume untrusted JSON input. A remote user could abuse this flaw to produce a hash collision in the underlying unordered-containers library by sending specially crafted JSON data, resulting in a denial of service.
[
{
"vendor": "n/a",
"product": "aeson",
"versions": [
{
"version": "Fixed in 2.0.1.0",
"status": "affected"
}
]
}
]