Vulnerabilities in pkg:maven/io.netty/netty-codec-http2

Q: What is CVE-2026-48043?

CVE-2026-48043 is a security vulnerability in netty-codec-http2 involving ByteBuf Reference-Count Leak in DelegatingDecompressorFrameListener Leads to Memory Exhaustion under CWE-400: Uncontrolled Resource Consumption.

Q: Which netty-codec-http2 versions are affected?

Affected versions include releases prior to 4.2.15.Final, 4.1.135.Final across affected packages: io.netty:netty-codec-http2.

Q: What version fixes CVE-2026-48043?

Upgrading to 4.2.15.Final, 4.1.135.Final (or the latest patched release for your respective branch) resolves the vulnerability.

Q: Is netty-codec-http2 affected?

Yes, io.netty:netty-codec-http2 is affected in releases prior to 4.2.15.Final, 4.1.135.Final. Upgrade your dependency to 4.2.15.Final, 4.1.135.Final or later.

Q: What is the CVSS score of CVE-2026-48043?

CVE-2026-48043 has a CVSS v3.1 base score of 5.3 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.

Q: What CWE is associated with CVE-2026-48043?

CVE-2026-48043 is classified under CWE-400: Uncontrolled Resource Consumption (The product does not properly control the allocation and maintenance of a limited resource.).

Q: How can I check Maven dependencies for CVE-2026-48043?

Run the dependency tree command: 'mvn dependency:tree -Dincludes=io.netty'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.

PACKAGE

Advisory Identifier: GHSA-c2gf-v879-257j

Advisory Summary

CVE-2026-48043 is a MODERATE (CVSS 5.3) bytebuf reference-count leak vulnerability (CWE-400: Uncontrolled Resource Consumption) affecting netty-codec-http2 libraries in the Maven ecosystem. The issue involves bytebuf reference-count leak in delegatingdecompressorframelistener leads to memory exhaustion. Remediation is available by upgrading affected packages to version 4.2.15.Final, 4.1.135.Final.

11 Known Advisory Record(s)

Package Vulnerability Intelligence

pkg:maven/io.netty/netty-codec-http2

11 Known Advisory Record(s)

Vulnerability advisories affecting package pkg:maven/io.netty/netty-codec-http2. Select an advisory below to view technical details or fixes.

Advisory ID	CVE / NVD	Severity	Summary
GHSA-c2gf-v879-257j	CVE-2026-48043	MODERATE	netty-codec-http2: ByteBuf Reference-Count Leak in DelegatingDecompressorFrameListener Leads to Memory Exhaustion
GHSA-93wv-jw9v-4972	CVE-2026-56819	HIGH	Netty: HTTP/2 decompression leaks ByteBuf reference count when the decompressor channel is already closed (Direct memory leak / OOM DoS)
GHSA-c69g-56f8-xwqj	CVE-2026-59900	MODERATE	Netty: [codec-http2] Lack of Host Header Deduplication in HTTP/2→HTTP/1.x Translation Leads to Request Routing Bypass
GHSA-563q-j3cm-6jxm	CVE-2026-50560	MODERATE	Netty susceptible to HTTP/2 Reset Attack with different on-the-wire signature
GHSA-5x3r-wrvg-rp6q	CVE-2026-47244	MODERATE	Netty HTTP/2: Advertised MAX_CONCURRENT_STREAMS are not enforced
GHSA-f6hv-jmp6-3vwv	CVE-2026-42587	HIGH	Netty: HttpContentDecompressor maxAllocation bypass when Content-Encoding set to br/zstd/snappy leads to decompression bomb DoS
GHSA-w9fj-cfpg-grvv	CVE-2026-33871	HIGH	Netty HTTP/2 CONTINUATION Frame Flood DoS via Zero-Byte Frame Bypass
GHSA-prj3-ccx8-p6x4	CVE-2025-55163	HIGH	Netty affected by MadeYouReset HTTP/2 DDoS vulnerability
GHSA-xpw8-rcwv-8f8p	-	HIGH	io.netty:netty-codec-http2 vulnerable to HTTP/2 Rapid Reset Attack
GHSA-f256-j965-7f32	CVE-2021-21409	MODERATE	Possible request smuggling in HTTP/2 due missing validation of content-length
GHSA-wm47-8v5p-wjpj	CVE-2021-21295	MODERATE	Possible request smuggling in HTTP/2 due missing validation

CVE-2026-48043 at a Glance

CVE Identifier CVE-2026-48043

GHSA Identifier GHSA-c2gf-v879-257j

Severity MODERATE

CVSS v3.1 Base Score 5.3

CWE Classification CWE-400: Uncontrolled Resource Consumption

Affected Product netty-codec-http2

Package Ecosystem Maven

Published Date 2026-06-11

Last Updated 2026-10-06

Security Impact

CVSS: 5.3

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L).

Attack Vector Network (AV:N)

Attack Complexity Low (AC:L)

Privileges Required None (PR:N)

User Interaction None (UI:N)

Scope Unchanged (S:U)

Confidentiality None (C:N)

Integrity None (I:N)

Availability Low (A:L)

How to Fix CVE-2026-48043

To remediate this vulnerability, upgrade all affected netty-codec-http2 dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

io.netty:netty-codec-http2 fixed: 4.2.15.Final

<dependency>
    <groupId>io.netty</groupId>
    <artifactId>netty-codec-http2</artifactId>
    <version>4.2.15.Final</version>
</dependency>

io.netty:netty-codec-http2 fixed: 4.1.135.Final

<dependency>
    <groupId>io.netty</groupId>
    <artifactId>netty-codec-http2</artifactId>
    <version>4.1.135.Final</version>
</dependency>

Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release:

mvn dependency:tree -Dincludes=io.netty

How to Check if You Are Affected

To determine whether your Java application is affected by CVE-2026-48043, inspect your build dependencies using the Maven Dependency Plugin:

mvn dependency:tree -Dincludes=io.netty

Analyze the terminal output to locate any version of netty-codec-http2 in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 4.2.15.Final), your application is affected.

Note: The mvn dependency:tree -Dincludes=io.netty command inspects the resolved dependency graph declared in your project's POM files; it does not perform automated security scanning or inspect runtime dynamic classpaths. Always verify runtime container classpaths and shaded JARs.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-400: Uncontrolled Resource Consumption, where the product does not properly control the allocation and maintenance of a limited resource. In netty-codec-http2, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

### Impact 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.

CVE-2026-48043 Affected netty-codec-http2 Versions

2 component(s)

Fixed Versions:

4.2.15.Final4.1.135.Final

Product / Package	Ecosystem	Affected Versions	Fixed Version
io.netty:netty-codec-http2 maven/io.netty/netty-codec-http2	Maven	≥ 4.2.0.Alpha1 < 4.2.15.Final	4.2.15.Final
io.netty:netty-codec-http2 maven/io.netty/netty-codec-http2	Maven	< 4.1.135.Final	4.1.135.Final

References

GitHub Advisory / Wiki ADVISORY

https://github.com/netty/netty/security/advisories/GHSA-c2gf-v879-257j

NVD — CVE-2026-48043 NVD

https://nvd.nist.gov/vuln/detail/CVE-2026-48043

Security Fix Commit FIX COMMIT

https://github.com/netty/netty/commit/db6138b168699736a6463c367e12ad0a4c36a25e

Security Fix Commit FIX COMMIT

https://github.com/netty/netty/commit/3d45a1e4e8eb99144f716e54be5ac57e525fa7ca

netty-codec-http2 Security Information SECURITY

https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-48043.json

netty-codec-http2 Release RELEASE

https://github.com/netty/netty/releases/tag/netty-4.2.15.Final

netty-codec-http2 Release RELEASE

https://github.com/netty/netty/releases/tag/netty-4.1.135.Final

netty-codec-http2 Source Repository REPOSITORY

https://github.com/netty/netty

bugzilla.redhat.com/show_bug.cgi WEB

https://bugzilla.redhat.com/show_bug.cgi?id=2488442

netty-codec-http2 Security Information SECURITY

https://access.redhat.com/security/cve/CVE-2026-48043

access.redhat.com/errata/rhsa-2026:66... WEB

https://access.redhat.com/errata/RHSA-2026:66488

access.redhat.com/errata/rhsa-2026:65... WEB

https://access.redhat.com/errata/RHSA-2026:65126

access.redhat.com/errata/rhsa-2026:54... WEB

https://access.redhat.com/errata/RHSA-2026:54435

access.redhat.com/errata/rhsa-2026:53... WEB

https://access.redhat.com/errata/RHSA-2026:53806

access.redhat.com/errata/rhsa-2026:53... WEB

https://access.redhat.com/errata/RHSA-2026:53646

access.redhat.com/errata/rhsa-2026:53... WEB

https://access.redhat.com/errata/RHSA-2026:53645

access.redhat.com/errata/rhsa-2026:53... WEB

https://access.redhat.com/errata/RHSA-2026:53644

access.redhat.com/errata/rhsa-2026:50... WEB

https://access.redhat.com/errata/RHSA-2026:50085

access.redhat.com/errata/rhsa-2026:48... WEB

https://access.redhat.com/errata/RHSA-2026:48151

access.redhat.com/errata/rhsa-2026:48... WEB

https://access.redhat.com/errata/RHSA-2026:48124

access.redhat.com/errata/rhsa-2026:41... WEB

https://access.redhat.com/errata/RHSA-2026:41951

access.redhat.com/errata/rhsa-2026:37... WEB

https://access.redhat.com/errata/RHSA-2026:37390

access.redhat.com/errata/rhsa-2026:36... WEB

https://access.redhat.com/errata/RHSA-2026:36820

access.redhat.com/errata/rhsa-2026:34... WEB

https://access.redhat.com/errata/RHSA-2026:34608

access.redhat.com/errata/rhsa-2026:26... WEB

https://access.redhat.com/errata/RHSA-2026:26586

access.redhat.com/errata/rhsa-2026:26... WEB

https://access.redhat.com/errata/RHSA-2026:26018

access.redhat.com/errata/rhsa-2026:26... WEB

https://access.redhat.com/errata/RHSA-2026:26017

Frequently Asked Questions

What is CVE-2026-48043?

CVE-2026-48043 is a security vulnerability in netty-codec-http2 involving ByteBuf Reference-Count Leak in DelegatingDecompressorFrameListener Leads to Memory Exhaustion under CWE-400: Uncontrolled Resource Consumption.

Which netty-codec-http2 versions are affected?

Affected versions include releases prior to 4.2.15.Final, 4.1.135.Final across affected packages: io.netty:netty-codec-http2.

What version fixes CVE-2026-48043?

Upgrading to 4.2.15.Final, 4.1.135.Final (or the latest patched release for your respective branch) resolves the vulnerability.

Is netty-codec-http2 affected?

Yes, io.netty:netty-codec-http2 is affected in releases prior to 4.2.15.Final, 4.1.135.Final. Upgrade your dependency to 4.2.15.Final, 4.1.135.Final or later.

What is the CVSS score of CVE-2026-48043?

CVE-2026-48043 has a CVSS v3.1 base score of 5.3 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.

What CWE is associated with CVE-2026-48043?

CVE-2026-48043 is classified under CWE-400: Uncontrolled Resource Consumption (The product does not properly control the allocation and maintenance of a limited resource.).

How can I check Maven dependencies for CVE-2026-48043?

Run the dependency tree command: 'mvn dependency:tree -Dincludes=io.netty'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.

Machine-readable OSV JSON OSV v1.5 Schema

Normalized schema output

View Raw JSON

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CVSS V3

5.3 MODERATE

Attack Vector Network (AV:N)

Attack Complexity Low (AC:L)

Privileges Required None (PR:N)

User Interaction None (UI:N)

Scope Unchanged (S:U)

Confidentiality None (C:N)

Integrity None (I:N)

Availability Low (A:L)

Vector String

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

Advisory Metadata

Source ID: GHSA-c2gf-v879-257j
Schema Version: 1.4.0
Published: 2026-06-11 13:28
Last Modified: 2026-10-06 19:33
Database Record File: advisories/github-reviewed/2026/06/GHSA-c2gf-v879-257j/GHSA-c2gf-v879-257j.json