{"id":"CVE-2026-42586","published":"2026-05-13T18:20:46Z","modified":"2026-05-14T18:17:23Z","title":"Netty: CRLF Injection in Netty Redis Codec Encoder","vendor":"netty","product":"netty","tier":"tail","description":{"text":"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.","provenance":"source","from":"CVE.org"},"cvss":{"score":6.8,"severity":"MEDIUM","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N","provenance":"source","from":"CVE.org CNA"},"epss":{"score":0.00217,"percentile":0.12208,"provenance":"source"},"cwes":[{"id":"CWE-93","name":"Improper Neutralization of CRLF Sequences"}],"references":[{"url":"https://github.com/netty/netty/security/advisories/GHSA-rgrr-p7gp-5xj7","tags":["x_refsource_CONFIRM"]}],"priority":{"score":7.2,"factors":[{"name":"EPSS percentile","points":2.44},{"name":"CVSS severity","points":4.76}]},"vendorSlug":"netty","affectedVersions":[{"vendor":"netty","product":"netty","versions":[">= 4.2.0.Alpha1, < 4.2.13.Final","< 4.1.133.Final"]},{"vendor":"io.netty","product":"netty-codec-redis","versions":[">= 4.2.0.Alpha1, < 4.2.13.Final","< 4.1.133.Final"]}],"affected":[{"ecosystem":"Maven","package":"io.netty:netty-codec-redis","vulnerableRanges":[">=4.2.0.Alpha1, <4.2.13.Final","<4.1.133.Final"],"patched":["4.2.13.Final","4.1.133.Final"],"from":["GHSA-rgrr-p7gp-5xj7"],"provenance":"source"}],"euvd":{"id":"EUVD-2026-30129","exploited":false,"provenance":"source"},"lineage":{"familyId":"fam-netty-cve-2021-21295","parents":[{"from":"CVE-2025-59419","to":"CVE-2026-42586","relation":"related","confidence":"high","kind":"lineage","evidence":[{"kind":"osv-related","provenance":"source","id":"GHSA-rgrr-p7gp-5xj7","via":"reference","url":"https://github.com/netty/netty/security/advisories/GHSA-jq43-27x9-3v86"}]},{"from":"CVE-2025-67735","to":"CVE-2026-42586","relation":"related","confidence":"high","kind":"lineage","evidence":[{"kind":"osv-related","provenance":"source","id":"GHSA-rgrr-p7gp-5xj7","via":"reference","url":"https://github.com/netty/netty/security/advisories/GHSA-84h7-rjj3-6jx4"}]}]}}