{"action":"Upgrade github.com/nats-io/nats-server/v2 to 2.11.15 or later.","affected":[{"fixed":"2.11.15","introduced":"0"},{"fixed":"2.12.6","introduced":"2.12.0-RC.1"}],"component":"github.com/nats-io/nats-server/v2","cve_ids":["CVE-2026-33215"],"ecosystem":"Go","epss":0.00244,"exploited":false,"fixed_versions":["2.11.15","2.12.6"],"ghsa_id":"GHSA-fcjp-h8cc-6879","id":"tcs_01M5KF8XMWVTWPPCKGQ9J1H61K","modified_at":"2026-09-10T03:51:00.306717387Z","published_at":"2026-03-24T21:39:52Z","references":["https://osv.dev/vulnerability/GHSA-fcjp-h8cc-6879","https://github.com/nats-io/nats-server/security/advisories/GHSA-fcjp-h8cc-6879","https://nvd.nist.gov/vuln/detail/CVE-2026-33215","https://advisories.nats.io/CVE/secnote-2026-06.tx","https://github.com/nats-io/nats-server","https://pkg.go.dev/vuln/GO-2026-4833"],"severity":{"label":"medium","score":6.5},"sources":[{"source":"osv","source_id":"GHSA-fcjp-h8cc-6879","url":"https://osv.dev/vulnerability/GHSA-fcjp-h8cc-6879"}],"summary":"NATS is vulnerable to MQTT hijacking via Client ID"}