Resource exhaustion in Netty - CVE-2026-59902
Published: August 8, 2026
Vulnerability identifier: #VU141320
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-59902
CWE-ID: CWE-400
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to uncontrolled resource consumption in io.netty.handler.codec.sctp.SctpMessageCompletionHandler when buffering incomplete SCTP message fragments. A remote attacker can send large SCTP fragments to cause a denial of service.
By opening a small number of concurrent connections, memory consumption can grow until an OutOfMemoryError occurs.
Affected software
Netty
How to mitigate CVE-2026-59902
Install security update from vendor's website.
Netty - addressed in versions 4.1.137, 4.2.17