> CVE-2026-56819 [HIGH]

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PUBLISHED
2026-07-21 23:17
MODIFIED
2026-07-21 23:17
CVSS_SCORE V3
7.5
EPSS (Prob. Exploit)
0.66%
Top 48.2%
DATA SOURCES:
NVD đź”— 2026-07-22 CWE MITRE đź”— 2026-11-01 FIRST EPSS đź”— 2026-11-01 GITHUB đź”— 2026-11-05 OSV đź”— 2026-11-02

> DESCRIPTION

Netty is a network application framework for development of protocol servers and clients. In versions 4.2.0.Final through 4.2.15.Final and 4.1.0.Final through 4.1.135.Final, a remote unauthenticated peer can leak one direct `ByteBuf` per HTTP/2 `DATA` frame in applications that enable HTTP/2 content decompression via `DelegatingDecompressorFrameListener`. When a `DATA` frame is processed for a stream whose decompressor has already been closed, `Http2Decompressor.decompress(...)` calls `decompressor.writeInbound(data.retain())` and does not release the retained buffer on the error path, eventually exhausting direct memory and crashing the JVM. This issue is fixed in versions 4.1.136.Final and 4.2.16.Final.

> AFFECTED_PRODUCTS

ℹ️ Aucun produit affecté n'a encore été publié par NVD pour cette CVE.

> CVSS V3 METRICS

CVSS_VECTOR
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EXPLOITABILITY
3.9
IMPACT
3.6

> MÉTRIQUES CVSS DÉTAILLÉES

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Métrique Valeur Interprétation
AV (Vecteur d'Attaque)
Attack Vector
Network (N)
Exploit possible à distance via réseau (HTTP, API, etc.)
AC (Complexité d'Attaque)
Attack Complexity
Low (L)
Peu de conditions requises pour exploiter
PR (Privilèges Requis)
Privileges Required
None (N)
Aucune authentification requise
UI (Interaction Utilisateur)
User Interaction
None (N)
Aucune interaction utilisateur nécessaire
S (Périmètre)
Scope
Unchanged (U)
Impact reste dans le périmètre du composant compromis
C (Impact Confidentialité)
Confidentiality Impact
None (N)
Aucune divulgation d'informations
I (Impact Intégrité)
Integrity Impact
None (N)
Aucune modification de données possible
A (Impact Disponibilité)
Availability Impact
High (H)
Interruption totale du service possible

> RÉSUMÉ DES IMPACTS

Confidentialité
None
Aucune divulgation d'informations
Intégrité
None
Aucune modification de données possible
Disponibilité
High
Interruption totale du service possible

> WEAKNESSES

CWE-400 CWE-401

> CWE DETAILED DESCRIPTIONS

CWE-400: Uncontrolled Resource Consumption - The product does not properly control the allocation and maintenance of a limited resource. | CWE-401: Missing Release of Memory after Effective Lifetime - The product does not sufficiently track and release allocated memory after it has been used, making the memory unavailable for reallocation and reuse.

> RED HAT SECURITY ADVISORIES

Red Hat Security Advisory: Red Hat build of Quarkus 3.27.4.SP3 security update
An update is now available for Red Hat build of Quarkus. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base sco...
Red Hat Security Advisory: Red Hat Build of Apache Camel 4.18.3 for Quarkus 3.33 update is now available (RHBQ 3.33.2.SP3)
An update for Red Hat Build of Apache Camel 4.18.3 for Quarkus 3.33 update is now available (RHBQ 3.33.2.SP3). The purpose of this text-only errata is to inform you about the enhancements that improve...
Red Hat Security Advisory: Red Hat build of Quarkus 3.33.2.SP3 security update
An update is now available for Red Hat build of Quarkus. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base sco...
Red Hat Security Advisory: Streams for Apache Kafka 3.2.1 release and security update
Streams for Apache Kafka 3.2.1 is now available from the Red Hat Customer Portal. Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scorin...
Red Hat Security Advisory: Red Hat Build of Apache Camel 4.18.3 for Spring Boot release.
Red Hat build of Apache Camel 4.18.3 for Spring Boot patch release and security update is now available. Red Hat Product Security has rated this update as having a security impact of Important. A Com...
Red Hat Security Advisory: Red Hat OpenShift Dev Spaces 3.30.0 Release.
Red Hat OpenShift Dev Spaces 3.30.0 has been released.
Red Hat Security Advisory: RHOAI 2.25.11 - Red Hat OpenShift AI
Updated images are now available for Red Hat OpenShift AI.
Red Hat Security Advisory: Red Hat AMQ Broker 7.14.1 release and security update
Red Hat AMQ Broker 7.14.1 is now available from the Red Hat Customer Portal. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring Sy...
Red Hat Security Advisory: Red Hat build of Cryostat security update
An update is now available for the Red Hat build of Cryostat 4 on RHEL 9. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring Syste...
Red Hat Security Advisory: Red Hat Data Grid 8.6.3 security update
An update for Red Hat Data Grid 8 is now available. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score,...
Red Hat Security Advisory: Apicurio Registry (container images) release and security update [ 3.3.3 GA ]
An update to the images for Red Hat build of Apicurio Registry is now available from the Red Hat Container Catalog. The purpose of this text-only errata is to inform you about the security issues fixe...
Red Hat Security Advisory: RHOAI 3.4.5 - Red Hat OpenShift AI
Updated images are now available for Red Hat OpenShift AI.
Red Hat Security Advisory: RHOAI 2.25.12 - Red Hat OpenShift AI
Updated images are now available for Red Hat OpenShift AI.
Red Hat Security Advisory: Red Hat OpenShift Dev Spaces 3.31.0 Release.
Red Hat OpenShift Dev Spaces 3.31.0 has been released.

> GITHUB SECURITY ADVISORY

GHSA-93wv-jw9v-4972 HIGH

Netty: HTTP/2 decompression leaks ByteBuf reference count when the decompressor channel is already closed (Direct memory leak / OOM DoS)

AFFECTED PACKAGES:
MAVEN / io.netty:netty-codec-http2
>= 4.1.0.Final, <= 4.1.135.Final
Fixed in: 4.1.136.Final
MAVEN / io.netty:netty-codec-http2
>= 4.2.0, <= 4.2.15.Final
Fixed in: 4.2.16.Final

> OSV (GOOGLE OPEN SOURCE VULNERABILITIES)

Netty: HTTP/2 decompression leaks ByteBuf reference count when the decompressor channel is already closed (Direct memory leak / OOM DoS)

AFFECTED PACKAGES:
Unknown / Unknown
152 versions affected
ALIASES:
GHSA-93wv-jw9v-4972

> HISTORIQUE DES MODIFICATIONS

Première apparition
21/07/2026 23:17
Source: NVD
đź“Š ENRICHISSEMENT 01/08/2026 06:01
CWE
Champ modifié: Description CWE
Ancienne valeur:
N/A
Nouvelle valeur:
CWE-400: Uncontrolled Resource Consumption - The product does not properly control the allocation and maintenance of a limited resource. | CWE-401: Missing Release of Memory after Effective Lifetime -...
Total des modifications: 1 Dernière mise à jour: 3 months ago

> REFERENCES

https://github.com/netty/netty/commit/5b68c61f37aa4a3045cba624cbea239655c9003bht...
https://github.com/netty/netty/commit/bb2ff68a1fb71cb4b0eb9a9e17b66c52aff680c6
https://github.com/netty/netty/releases/tag/netty-4.1.136.Final
https://github.com/netty/netty/releases/tag/netty-4.2.16.Final
https://github.com/netty/netty/security/advisories/GHSA-93wv-jw9v-4972
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