Network Application Framework Vulnerability in Netty by Vendor Netty
CVE-2026-46340

7.5HIGH

Key Information:

Vendor

Netty

Status
Netty
Vendor
CVE Published:
12 June 2026

What is CVE-2026-46340?

The vulnerability in the netty-transport-sctp allows for unbounded growth of CompositeByteBuf structures due to an attacker exploiting non-complete SctpMessage fragments. As a result, an attacker can open multiple stream identifiers without limitations, causing the instance to recursively handle an ever-growing number of buffers, leading to potential resource exhaustion and performance degradation. Updating to versions 4.1.135.Final or 4.2.15.Final mitigates this issue.

Affected Version(s)

netty >= 4.2.0.Final, < 4.2.15.Final < 4.2.0.Final, 4.2.15.Final

netty < 4.1.135.Final < 4.1.135.Final

References

https://github.com/netty/netty/security/advisories/GHSA-5...
x_refsource_CONFIRM
https://github.com/netty/netty/releases/tag/netty-4.1.135...
x_refsource_MISC
https://github.com/netty/netty/releases/tag/netty-4.2.15....
x_refsource_MISC

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.