All versions of bson before 1.1.4 are vulnerable to Deserialization of Untrusted Data. The package will ignore an unknown value for an object's _bsontype, leading to cases where an object is serialized as a document rather than the intended BSON type.
{
"github_reviewed": true,
"cwe_ids": [
"CWE-502"
],
"github_reviewed_at": "2021-05-06T23:40:10Z",
"nvd_published_at": "2020-03-30T19:15:00Z",
"severity": "CRITICAL"
}