CVE-2026-48748

HIGH 7.5

Netty HTTP/3 QPACK Blocked Streams Memory Exhaustion

CVSS Score

7.5

EPSS Score

0.1%

EPSS Percentile

17th

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.

CWE	CWE-770
Vendor	netty
Product	netty
Published	Jun 12, 2026

Stay Ahead of the Next One

Get instant alerts for netty netty

Be the first to know when new high vulnerabilities affecting netty netty are published — delivered to Slack, Telegram or Discord.

Get Free Alerts → Free · No credit card · 60 sec setup

CVSS v3 Breakdown

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Affected Versions

netty / netty

>= 4.2.0.Final, < 4.2.15.Final

References

NVD ↗ CVE.org ↗ EPSS Data ↗

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