{"action":"Upgrade io.netty:netty-codec-http2 to 4.1.136.Final (4.1.x) or 4.2.16.Final (4.2.x) or later.","affected":[{"fixed":"4.2.16.Final","introduced":"4.2.0.Final"},{"fixed":"4.1.136.Final","introduced":"0"}],"component":"io.netty:netty-codec-http2","cve_ids":["CVE-2026-59900"],"ecosystem":"Maven","epss":0.00398,"exploited":false,"fixed_versions":["4.2.16.Final","4.1.136.Final"],"ghsa_id":"GHSA-c69g-56f8-xwqj","id":"tcs_01M5N8RQ40AY82RG236RYBN1HX","modified_at":"2026-09-10T03:51:11.564389466Z","published_at":"2026-07-22T21:49:28Z","references":["https://osv.dev/vulnerability/GHSA-c69g-56f8-xwqj","https://github.com/netty/netty/security/advisories/GHSA-c69g-56f8-xwqj","https://github.com/netty/netty","https://github.com/netty/netty/releases/tag/netty-4.1.136.Final","https://github.com/netty/netty/releases/tag/netty-4.2.16.Final"],"severity":{"label":"medium"},"sources":[{"source":"osv","source_id":"GHSA-c69g-56f8-xwqj","url":"https://osv.dev/vulnerability/GHSA-c69g-56f8-xwqj"}],"summary":"Netty: [codec-http2] Lack of Host Header Deduplication in HTTP/2→HTTP/1.x Translation Leads to Request Routing Bypass"}