{"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"},{"fixed":"4.1.136.Final","introduced":"4.1.0.Final"}],"component":"io.netty:netty-codec-http2","cve_ids":["CVE-2026-56819"],"ecosystem":"Maven","epss":0.00665,"exploited":false,"fixed_versions":["4.2.16.Final","4.1.136.Final"],"ghsa_id":"GHSA-93wv-jw9v-4972","id":"tcs_01M5N8P1DWGWD83QFCQMH6Z6PY","modified_at":"2026-09-10T03:51:11.318239719Z","published_at":"2026-07-31T16:51:50Z","references":["https://osv.dev/vulnerability/GHSA-93wv-jw9v-4972","https://github.com/netty/netty/security/advisories/GHSA-93wv-jw9v-4972","https://nvd.nist.gov/vuln/detail/CVE-2026-56819","https://github.com/netty/netty/commit/5b68c61f37aa4a3045cba624cbea239655c9003b","https://github.com/netty/netty/commit/bb2ff68a1fb71cb4b0eb9a9e17b66c52aff680c6","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":"high","score":7.5},"sources":[{"source":"osv","source_id":"GHSA-93wv-jw9v-4972","url":"https://osv.dev/vulnerability/GHSA-93wv-jw9v-4972"}],"summary":"Netty: HTTP/2 decompression leaks ByteBuf reference count when the decompressor channel is already closed (Direct memory leak / OOM DoS)"}