{"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-2026-33248"],"ecosystem":"Go","epss":0.00149,"exploited":false,"fixed_versions":["2.11.15","2.12.6"],"ghsa_id":"GHSA-3f24-pcvm-5jqc","id":"tcs_01M5KETNX84WXWH1XRDHT70ZYC","modified_at":"2026-09-10T03:50:36.808606306Z","published_at":"2026-03-24T21:51:08Z","references":["https://osv.dev/vulnerability/GHSA-3f24-pcvm-5jqc","https://github.com/nats-io/nats-server/security/advisories/GHSA-3f24-pcvm-5jqc","https://nvd.nist.gov/vuln/detail/CVE-2026-33248","https://advisories.nats.io/CVE/secnote-2026-13.txt","https://github.com/nats-io/nats-server"],"severity":{"label":"medium","score":4.2},"sources":[{"source":"osv","source_id":"GHSA-3f24-pcvm-5jqc","url":"https://osv.dev/vulnerability/GHSA-3f24-pcvm-5jqc"}],"summary":"NATS has mTLS verify_and_map authentication bypass via incorrect Subject DN matching"}