{"action":"Upgrade github.com/nats-io/nats-server/v2 to 2.11.14 or later.","affected":[{"fixed":"2.11.14","introduced":"2.2.0"},{"fixed":"2.12.5","introduced":"2.12.0"}],"component":"github.com/nats-io/nats-server/v2","cve_ids":["CVE-2026-27889"],"ecosystem":"Go","epss":0.00593,"exploited":false,"fixed_versions":["2.11.14","2.12.5"],"ghsa_id":"GHSA-pq2q-rcw4-3hr6","id":"tcs_01M5KGGFDYZBYB192RJEHKKSZR","modified_at":"2026-03-27T14:14:21.538339Z","published_at":"2026-03-26T20:33:05Z","references":["https://osv.dev/vulnerability/GO-2026-4841","https://github.com/nats-io/nats-server/security/advisories/GHSA-pq2q-rcw4-3hr6","https://advisories.nats.io/CVE/secnote-2026-03.txt"],"severity":{"label":"high","score":7.5},"sources":[{"source":"osv","source_id":"GO-2026-4841#Go/github.com/nats-io/nats-server/v2","url":"https://osv.dev/vulnerability/GO-2026-4841"},{"source":"nvd","source_id":"CVE-2026-27889","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-27889"}],"summary":"NATS: Pre-auth remote server crash via WebSocket frame length overflow in wsRead in github.com/nats-io/nats-server"}