Vulnerability in Io.netty Netty-codec-redis

CVE-2026-42586

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…

Vulnerability class: CRLF Injection

EPSS: 0.000 (0.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.8 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N.

Affected products

  • Io.netty Netty-codec-redis — versions >= 4.2.0.Alpha1, < 4.2.13.Final, < 4.1.133.Final
  • Netty — versions >= 4.2.0.Alpha1, < 4.2.13.Final, < 4.1.133.Final

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-42586?
CVE-2026-42586 is a medium-severity vulnerability in Io.netty Netty-codec-redis, classified under CRLF Injection. CVSS score: 6.8/10. Published 2026-05-13.
How severe is CVE-2026-42586?
Medium severity. CVSS v3 base score is 6.8 out of 10.