{"action":"Upgrade h3 to 1.15.9 or later.","affected":[{"fixed":"2.0.1-rc.17","introduced":"2.0.0-beta.0"},{"fixed":"1.15.9","introduced":"0"}],"component":"h3","cve_ids":["CVE-2026-86252"],"ecosystem":"npm","epss":0.0036,"exploited":false,"fixed_versions":["2.0.1-rc.17","1.15.9"],"ghsa_id":"GHSA-4hxc-9384-m385","id":"tcs_01M5KF0NHG5TZDXTVEK72TABS4","modified_at":"2026-09-10T03:50:37.291276895Z","published_at":"2026-03-20T20:50:38Z","references":["https://osv.dev/vulnerability/GHSA-4hxc-9384-m385","https://github.com/h3js/h3/security/advisories/GHSA-4hxc-9384-m385","https://github.com/h3js/h3"],"severity":{"label":"medium","score":5.3},"sources":[{"source":"osv","source_id":"GHSA-4hxc-9384-m385","url":"https://osv.dev/vulnerability/GHSA-4hxc-9384-m385"}],"summary":"h3: SSE Event Injection via Unsanitized Carriage Return (`\\r`) in EventStream Data and Comment Fields (Bypass of CVE Fix)"}