{"id":"CVE-2026-42580","aliases":["GHSA-m4cv-j2px-7723"],"url":"https://o3.security/vulnerability/CVE-2026-42580","summary":"Netty: HTTP Request Smuggling due to incorrect chunk size parsing","details":"Netty is an asynchronous, event-driven network application framework. Prior to 4.2.13.Final and 4.1.133.Final, Netty's chunk size parser silently overflows int, enabling request smuggling attacks. This vulnerability is fixed in 4.2.13.Final and 4.1.133.Final.","published":"2026-05-13T18:04:03.690Z","modified":"2026-08-07T11:31:25.046799613Z","cvss":{"score":6.5,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Maven","name":"io.netty:netty-codec-http","fixedVersion":"4.2.13.Final"},{"ecosystem":"Maven","name":"io.netty:netty-codec-http","fixedVersion":"4.1.133.Final"}],"fix":null,"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42580.json"},{"type":"ADVISORY","url":"https://github.com/netty/netty/security/advisories/GHSA-m4cv-j2px-7723"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-42580"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-07T11:31:25.046799613Z"}}