CVE-2026-48748 PUBLISHED

Netty HTTP/3 QPACK Blocked Streams Memory Exhaustion

Assigner: GitHub_M
Reserved: 22.05.2026 Published: 12.06.2026 Updated: 12.06.2026

Netty is a network application framework for development of protocol servers and clients. Prior to version 4.2.15.Final, a memory exhaustion vulnerability in the Netty HTTP/3 codec allows the creation of an infinite number of blocked streams, which can cause OOM error. Version 4.2.15.Final patches the issue.

Metrics

CVSS 3.1

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS Score: 7.5

Attack Vector	Network	Scope	Unchanged
Attack Complexity	Low	Confidentiality Impact	None
Privileges Required	None	Integrity Impact	None
User Interaction	None	Availability Impact	High

CVSS 3.1

Product Status

Vendor	netty
Product	netty
Versions	Version >= 4.2.0.Final, < 4.2.15.Final is affected

References

https://github.com/netty/netty/security/advisories/GHSA-4grm-h2qv-h6w6
https://github.com/netty/netty/releases/tag/netty-4.2.15.Final

Problem Types

CWE-770: Allocation of Resources Without Limits or Throttling CWE