{"id":"CVE-2026-42586","aliases":["GHSA-rgrr-p7gp-5xj7"],"url":"https://o3.security/vulnerability/CVE-2026-42586","summary":"Netty: CRLF Injection in Netty Redis Codec Encoder","details":"Netty is an asynchronous, event-driven network application framework. Prior to 4.2.13.Final and 4.1.133.Final, the Netty Redis codec encoder (RedisEncoder) writes user-controlled string content directly to the network output buffer without validating or sanitizing CRLF (\\r\\n) characters. Since the Redis Serialization Protocol (RESP) uses CRLF as the command/response delimiter, an attacker who can control the content of a Redis message can inject arbitrary Redis commands or forge fake responses. This vulnerability is fixed in 4.2.13.Final and 4.1.133.Final.","published":"2026-05-13T18:20:46.999Z","modified":"2026-08-07T11:31:01.894614888Z","cvss":{"score":6.8,"severity":"MEDIUM","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Maven","name":"io.netty:netty-codec-redis","fixedVersion":"4.2.13.Final"},{"ecosystem":"Maven","name":"io.netty:netty-codec-redis","fixedVersion":"4.1.133.Final"}],"fix":null,"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42586.json"},{"type":"ADVISORY","url":"https://github.com/netty/netty/security/advisories/GHSA-rgrr-p7gp-5xj7"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-42586"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-07T11:31:01.894614888Z"}}