> CVE-2026-55831 [HIGH]

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PUBLISHED
2026-07-21 00:17
MODIFIED
2026-07-21 00:17
CVSS_SCORE V3
7.5
EPSS (Prob. Exploit)
0.66%
Top 48.2%
DATA SOURCES:
NVD đź”— 2026-07-21 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. Prior to 4.1.136.Final and 4.2.16.Final, Netty's SPDY SETTINGS decoder accepts a peer-declared SETTINGS entry count up to the 24-bit frame-length limit and materializes every unique setting ID in `DefaultSpdySettingsFrame`, allowing a remote SPDY/3.1 peer to send a syntactically valid roughly 2 MiB SETTINGS frame that creates 262144 map entries and amplifies network input into heap growth and ordered-map insertion work. 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-770

> CWE DETAILED DESCRIPTIONS

CWE-400: Uncontrolled Resource Consumption - The product does not properly control the allocation and maintenance of a limited resource. | CWE-770: Allocation of Resources Without Limits or Throttling - The product allocates a reusable resource or group of resources on behalf of an actor without imposing any intended restrictions on the size or number of resources that can be allocated.

> RED HAT SECURITY ADVISORIES

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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
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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.
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Red Hat Security Advisory: Red Hat JBoss Enterprise Application Platform 8.1.8 security update
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Red Hat Security Advisory: Red Hat JBoss Enterprise Application Platform 8.1.8 security update
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Red Hat Security Advisory: Red Hat JBoss Enterprise Application Platform 8.1.8 security update
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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-6jqx-86gh-f27w HIGH

Netty SPDY SETTINGS frame count materializes unbounded settings map

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

> OSV (GOOGLE OPEN SOURCE VULNERABILITIES)

Netty SPDY SETTINGS frame count materializes unbounded settings map

AFFECTED PACKAGES:
Unknown / Unknown
152 versions affected
ALIASES:
GHSA-6jqx-86gh-f27w

> HISTORIQUE DES MODIFICATIONS

Première apparition
21/07/2026 00:17
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-770: Allocation of Resources Without Limits or Throttling...
Total des modifications: 1 Dernière mise à jour: 3 months ago

> REFERENCES

https://github.com/netty/netty/commit/5b68c61f37aa4a3045cba624cbea239655c9003b
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-6jqx-86gh-f27w
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