{"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_01M5KGGDNMJ853K32K09X22F25","modified_at":"2026-03-27T17:29:30.301970Z","published_at":"2026-03-26T20:33:05Z","references":["https://osv.dev/vulnerability/GO-2026-4833","https://github.com/nats-io/nats-server/security/advisories/GHSA-fcjp-h8cc-6879","https://nvd.nist.gov/vuln/detail/CVE-2026-33215"],"severity":{"label":"medium","score":6.5},"sources":[{"source":"osv","source_id":"GO-2026-4833#Go/github.com/nats-io/nats-server/v2","url":"https://osv.dev/vulnerability/GO-2026-4833"},{"source":"nvd","source_id":"CVE-2026-33215","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-33215"}],"summary":"NATS is vulnerable to MQTT hijacking via Client ID in github.com/nats-io/nats-server"}