CVE-2026-50011: Netty

High severity, CVSS 7.5. EPSS: 0.8% chance of exploitation in the next 30 days.

Netty is a network application framework for development of protocol servers and clients. Prior to versions 4.1.135.Final and 4.2.15.Final, RedisArrayAggregator pre-allocates ArrayList with initial capacity equal to the RESP array element count declared in an array header. That count is taken from the wire before the corresponding child messages exist. A small malicious header can claim a huge initial capacity. Versions 4.1.135.Final and 4.2.15.Final patch the issue.

Affected products

• Netty Netty: before 4.1.135 (fixed in 4.1.135); from 4.2.0, before 4.2.15 (fixed in 4.2.15)

Published 2026-06-12. Last modified 2026-09-18.