CVE-2026-59902: Netty

High severity, CVSS 7.5. EPSS: 0.4% chance of exploitation in the next 30 days.

Netty is an asynchronous, event-driven network application framework. Prior to 4.1.137.Final and 4.2.17.Final, io.netty.handler.codec.sctp.SctpMessageCompletionHandler limits incomplete messages and fragment counts but not maxBufferedBytes, allowing unauthenticated peers to exhaust memory with large SCTP fragments. This issue is fixed in versions 4.1.137.Final and 4.2.17.Final.

Affected products

• Netty Netty: before 4.1.137 (fixed in 4.1.137); from 4.2.0, before 4.2.17 (fixed in 4.2.17)

Published 2026-08-17. Last modified 2026-09-23.