NATS Server is a high-performance server for NATS.io, the cloud and edge native messaging system. Prior to 2.14.3 and 2.12.12, an authenticated MQTT client could subscribe to the internal $MQTT.deliver.pubrel subject family, bypassing configured subscribe permissions and exposing MQTT QoS2 protocol metadata for sessions in the account. This issue is fixed in versions 2.14.3 and 2.12.12.
{
"license": "CC-BY-4.0",
"sources": [
{
"database_specific": {
"status": "Analyzed"
},
"html_url": "https://nvd.nist.gov/vuln/detail/CVE-2026-58214",
"id": "CVE-2026-58214",
"imported": "2026-08-03T18:16:27.553Z",
"modified": "2026-07-13T15:17:13.573Z",
"published": "2026-07-08T20:16:54.347Z",
"url": "https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-58214"
}
]
}