{"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-2026-33218"],"ecosystem":"Go","epss":0.00627,"exploited":false,"fixed_versions":["2.11.15","2.12.6"],"ghsa_id":"GHSA-vprv-35vv-q339","id":"tcs_01M5KGGEZ3ZGENPN77RMPGF5ZT","modified_at":"2026-03-27T18:26:19.936468Z","published_at":"2026-03-26T20:33:05Z","references":["https://osv.dev/vulnerability/GO-2026-4837","https://github.com/nats-io/nats-server/security/advisories/GHSA-vprv-35vv-q339","https://advisories.nats.io/CVE/secnote-2026-10.txt"],"severity":{"label":"high","score":7.5},"sources":[{"source":"osv","source_id":"GO-2026-4837#Go/github.com/nats-io/nats-server/v2","url":"https://osv.dev/vulnerability/GO-2026-4837"},{"source":"nvd","source_id":"CVE-2026-33218","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-33218"}],"summary":"NATS has pre-auth server panic via leafnode handling in github.com/nats-io/nats-server"}