netty-codec-http2: ByteBuf Reference-Count Leak in DelegatingDecompressorFrameListener Leads to Memory Exhaustion

Summary

CVE	CVE-2026-48043
State	PUBLISHED
Assigner	GitHub_M
Source Priority	CVE Program / NVD first with legacy fallback
Published	2026-06-12 16:16:30 UTC
Updated	2026-07-03 13:17:23 UTC
Description	Netty is a network application framework for development of protocol servers and clients. In netty-codec-http2 prior to versions 4.1.135.Final and 4.2.15.Final, the `DelegatingDecompressorFrameListener` class orchestrates HTTP/2 decompression by embedding a per-stream `EmbeddedChannel` that runs the appropriate decompression codec (gzip, deflate, zstd) and forwards decompressed chunks to a wrapped listener. Each decompressed chunk is a pooled `ByteBuf` handed to an anonymous `ChannelInboundHandlerAdapter` tail handler, which becomes the sole owner responsible for releasing it. A remote peer could send frames that would result in the flow-controller throwing and so trigger a resource leak which at the end might take down the whole JVM due OOME. Versions 4.1.135.Final and 4.2.15.Final patch the issue.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from [email protected]

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

EPSS: 0.006090000 probability, percentile 0.444370000 (date 2026-06-20)

Version	Source	Type	Score	Severity	Vector
3.1	[email protected]	Primary	7.5	HIGH	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`
3.1	ADP	CVSS	7.5	HIGH	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`
3.1	[email protected]	Secondary	5.3	MEDIUM	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L`
3.1	0b0ca135-0b70-47e7-9f44-1890c2a1c46c	Secondary	7.5	HIGH	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`
3.1	CNA	DECLARED	5.3	MEDIUM	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L`

CVSS v3.1 Breakdown

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

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

NVD Known Affected Configurations (CPE 2.3)

Type	Vendor	Product	Version	Update	Edition	Language
Application	Netty	Netty	All	All	All	All

Vendor Declared Affected Products

Source	Vendor	Product	Version	Platforms
CNA	Netty	Netty	affected >= 4.2.0.Final, < 4.2.15.Final	Not specified
CNA	Netty	Netty	affected < 4.1.135.Final	Not specified
ADP	Red Hat	Red Hat Build Of Apache Camel 3.33 For Quarkus 3.33.2.SP1	Not specified	Not specified
ADP	Red Hat	Red Hat Build Of Quarkus 3.27.4.SP1	Not specified	Not specified
ADP	Red Hat	Red Hat Build Of Quarkus 3.33.2.SP1	Not specified	Not specified
ADP	Red Hat	Streams For Apache Kafka 2.9.4	Not specified	Not specified
ADP	Red Hat	Cryostat 4	Not specified	Not specified
ADP	Red Hat	OpenShift Serverless	Not specified	Not specified
ADP	Red Hat	Red Hat AMQ Broker 7	Not specified	Not specified
ADP	Red Hat	Red Hat Build Of Apache Camel - HawtIO 4	Not specified	Not specified
ADP	Red Hat	Red Hat Build Of Apache Camel 4 For Quarkus 3	Not specified	Not specified
ADP	Red Hat	Red Hat Build Of Apache Camel For Spring Boot 4	Not specified	Not specified
ADP	Red Hat	Red Hat Build Of Apicurio Registry 3	Not specified	Not specified
ADP	Red Hat	Red Hat Build Of Debezium 3	Not specified	Not specified
ADP	Red Hat	Red Hat Build Of Keycloak	Not specified	Not specified
ADP	Red Hat	Red Hat Data Grid 8	Not specified	Not specified
ADP	Red Hat	Red Hat Enterprise Linux AI RHEL AI 3	Not specified	Not specified
ADP	Red Hat	Red Hat Fuse 7	Not specified	Not specified
ADP	Red Hat	Red Hat JBoss Enterprise Application Platform 7	Not specified	Not specified
ADP	Red Hat	Red Hat JBoss Enterprise Application Platform Expansion Pack	Not specified	Not specified
ADP	Red Hat	Red Hat OpenShift AI RHOAI	Not specified	Not specified
ADP	Red Hat	Red Hat OpenShift Dev Spaces	Not specified	Not specified
ADP	Red Hat	Streams For Apache Kafka 3	Not specified	Not specified
ADP	Red Hat	Red Hat Single Sign-On 7	Not specified	Not specified

References

Reference	Source	Link	Tags
access.redhat.com/errata/RHSA-2026:26018	0b0ca135-0b70-47e7-9f44-1890c2a1c46c	access.redhat.com
access.redhat.com/errata/RHSA-2026:26017	0b0ca135-0b70-47e7-9f44-1890c2a1c46c	access.redhat.com
github.com/netty/netty/releases/tag/netty-4.1.135.Final	[email protected]	github.com	Release Notes
access.redhat.com/security/cve/CVE-2026-48043	0b0ca135-0b70-47e7-9f44-1890c2a1c46c	access.redhat.com
security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-48043.json	0b0ca135-0b70-47e7-9f44-1890c2a1c46c	security.access.redhat.com
access.redhat.com/errata/RHSA-2026:34608	0b0ca135-0b70-47e7-9f44-1890c2a1c46c	access.redhat.com
github.com/netty/netty/security/advisories/GHSA-c2gf-v879-257j	[email protected]	github.com	Vendor Advisory
bugzilla.redhat.com/show_bug.cgi	0b0ca135-0b70-47e7-9f44-1890c2a1c46c	bugzilla.redhat.com
access.redhat.com/errata/RHSA-2026:26586	0b0ca135-0b70-47e7-9f44-1890c2a1c46c	access.redhat.com
github.com/netty/netty/releases/tag/netty-4.2.15.Final	[email protected]	github.com	Release Notes
CVE Program record	CVE.ORG	www.cve.org	canonical
NVD vulnerability detail	NVD	nvd.nist.gov	canonical, analysis

No vendor comments have been submitted for this CVE.

Additional Advisory Data

Source	Time	Event
ADP	2026-06-12T16:02:56.371Z	Reported to Red Hat.
ADP	2026-06-12T14:39:52.498Z	Made public.

Solutions

ADP: RHSA-2026:26586: Red Hat Build of Apache Camel 3.33 for Quarkus 3.33.2.SP1

ADP: RHSA-2026:26018: Red Hat build of Quarkus 3.27.4.SP1

ADP: RHSA-2026:26017: Red Hat build of Quarkus 3.33.2.SP1

ADP: RHSA-2026:34608: Streams for Apache Kafka 2.9.4

Workarounds

ADP: Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.

There are currently no legacy QID mappings associated with this CVE.