A flaw was discovered in Elasticsearch, affecting document ingestion when an index template contains a dynamic field mapping of “passthrough” type. Under certain circumstances, ingesting documents in this index would cause a StackOverflow exception to be thrown and ultimately lead to a Denial of Service. Note that passthrough fields is an experimental feature.
{
"severity": "Medium",
"cpes": [
"cpe:2.3:a:elastic:elasticsearch:*:*:*:*:*:*:*:*",
"cpe:2.3:a:elastic:elasticsearch:*:*:*:*:*:maven:*:*"
]
}