{"id":"CVE-2026-42583","aliases":["GHSA-mj4r-2hfc-f8p6"],"url":"https://o3.security/vulnerability/CVE-2026-42583","summary":"Netty: Lz4FrameDecoder resource exhaustion","details":"Netty is an asynchronous, event-driven network application framework. Prior to 4.2.13.Final and 4.1.133.Final, Lz4FrameDecoder allocates a ByteBuf of size decompressedLength (up to 32 MB per block) before LZ4 runs. A peer only needs a 21-byte header plus compressedLength payload bytes - 22 bytes if compressedLength == 1 - to force that allocation. This vulnerability is fixed in 4.2.13.Final and 4.1.133.Final.","published":"2026-05-13T18:09:19.817Z","modified":"2026-08-12T03:51:16.738360817Z","cvss":{"score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},"epss":{"score":0.00429,"percentile":0.35595,"asOf":"2026-08-14"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Maven","name":"io.netty:netty-codec-compression","fixedVersion":"4.2.13.Final"},{"ecosystem":"Maven","name":"io.netty:netty-codec","fixedVersion":"4.1.133.Final"}],"fix":null,"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42583.json"},{"type":"ADVISORY","url":"https://github.com/netty/netty/security/advisories/GHSA-mj4r-2hfc-f8p6"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-42583"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:16.738360817Z"}}