CVE-2026-47244

mediumpriority · track · 0EPSS 0.004 · 32 %ileDEEUFRRUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

0.38% (32nd) EPSS

CVSS 5.3 · medium

Is it mine?

56 products

Check your exposure

Who says so?

6 sources

cnnvd · enisa_euvd · fstec_bdu · cert_bund

EPSS · scored 2026-10-27

Netty is a network application framework for development of protocol servers and clients. Prior to versions 4.1.135.Final and 4.2.15.Final, DefaultHttp2Connection.DefaultEndpoint initialises maxActiveStreams/maxStreams to Integer.MAX_VALUE, and Http2Settings never inserts SETTINGS_MAX_CONCURRENT_STREAMS by default (Http2Settings.java:305-307 only clamps a user-supplied value). Unless the application explicitly calls initialSettings().maxConcurrentStreams(n), a Netty HTTP/2 server advertises no limit and enforces none locally. Each open stream allocates a DefaultStream object, PropertyMap slots, flow-controller state and IntObjectHashMap entry; with ~2^30 permissible odd stream IDs a single TCP connection can create hundreds of thousands of long-lived stream objects. This is also the precondition for CVE-2023-44487-style Rapid-Reset amplification, where the absence of a low concurrent cap multiplies backend work. Versions 4.1.135.Final and 4.2.15.Final patch the issue.

cvss

Technical severity, 0–10. One row per scoring source.

5.3

010

base score 0–10 · higher = more severe · hover a vector to decode

v3.15.3mediumAV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Lsecondary · FSTEC (BDU) RU

v3.15.3mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Lsecondary · ENISA EU

v3.15.3mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Lsecondary · security-advisories@github.comexploitability 3.9 · impact 1.4

v3.15.3mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Lsecondary · OSV

v3.14.9mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:Usecondary · CVSS-BT (t0sche)

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: none · Automatable: yes · Technical Impact: partialcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-400USCWE-400USCWE-400US

affected products (56)

Products and version ranges known to be affected.

IBM App Connect Enterprise Professionalall versionscert_bundDEcpe:/a:ibm:app_connect_enterprise:professional
IBM DB2all versionscert_bundDEcpe:/a:ibm:db2:-
IBM Operational Decision Managerall versionscert_bundDEcpe:/a:ibm:operational_decision_manager:-
IBM SPSS Analytic Serverall versionscert_bundDEcpe:/a:ibm:spss:analytic_server
IBM Spectrum Scaleall versionscert_bundDEcpe:/a:ibm:spectrum_scale:-
IBM Sterling Connect:Directall versionscert_bundDEcpe:/a:ibm:sterling_connect%3adirect:-
Red Hat Enterprise Linuxall versionscert_bundDEcpe:/o:redhat:enterprise_linux:-
Red Hat Enterprise Linux Data Grid 8all versionscert_bundDEcpe:/o:redhat:enterprise_linux:data_grid_8
SUSE Linuxall versionscert_bundDEcpe:/o:suse:suse_linux:-
Ubuntu Linuxall versionscert_bundDEcpe:/o:canonical:ubuntu_linux:-
IBM Cognos Analytics< 12.0.4 FP3cert_bundDE
IBM Cognos Analytics< 12.1.3 FP2cert_bundDE
IBM Concert< 3.0.1.1cert_bundDE
IBM IBM Cognos Analytics <12.0.4 FP3< 12.0.4 FP3cert_bundDE
IBM IBM Cognos Analytics <12.1.3 FP2< 12.1.3 FP2cert_bundDE
IBM IBM Concert <3.0.1.1< 3.0.1.1cert_bundDE
Open Source Netty< 4.1.135.Finalcert_bundDE
Open Source Netty< 4.2.15.Finalcert_bundDE
Open Source Open Source Netty <4.1.135.Final< 4.1.135.Finalcert_bundDE
Open Source Open Source Netty <4.2.15.Final< 4.2.15.Finalcert_bundDE

showing 20 of 56

advisories (5)

Vendor and ecosystem advisories describing this.

WID-SEC-W-2026-1814Netty: Mehrere SchwachstellenDeutsch2026-06-07csaf · cert_bundDE
Ein entfernter, anonymer Angreifer kann mehrere Schwachstellen in Netty ausnutzen, um Sicherheitsvorkehrungen zu umgehen, Daten zu manipulieren, vertrauliche Informationen offenzulegen oder einen Denial-of-Service-Zustand herbeizuführen.
WID-SEC-W-2026-3047IBM Planning Analytics: Mehrere SchwachstellenDeutsch2026-08-26csaf · cert_bundDE
Ein entfernter, anonymer Angreifer kann mehrere Schwachstellen in IBM Planning Analytics ausnutzen, um einen Denial of Service Angriff durchzuführen oder Daten zu manipulieren.
GHSA-5x3r-wrvg-rp6qNetty HTTP/2: Advertised MAX_CONCURRENT_STREAMS are not enforced2026-06-08ghsa · osvUS
### Impact DefaultHttp2Connection.DefaultEndpoint initialises maxActiveStreams/maxStreams to Integer.MAX_VALUE, and Http2Settings never inserts SETTINGS_MAX_CONCURRENT_STREAMS by default (Http2Settings.java:305-307 only clamps a user-supplied value). Unless the application explicitly calls initialSettings().maxConcurrentStreams(n), a Netty HTTP/2 server advertises no limit and enforces none locally. Each open stream allocates a DefaultStream object, PropertyMap slots, flow-controller state and IntObjectHashMap entry; with ~2^30 permissible odd stream IDs a single TCP connection can create hundreds of thousands of long-lived stream objects. This is also the precondition for CVE-2023-44487-style Rapid-Reset amplification, where the absence of a low concurrent cap multiplies backend work. ### Resources https://www.rfc-editor.org/rfc/rfc7540.html#section-6.5.2
CERTFR-2026-AVI-1378Multiples vulnérabilités dans les produits IBMFrançais2026-10-23vendor · certfrFR
CERTFR-2026-AVI-1385Multiples vulnérabilités dans les produits VMwareFrançais2026-10-26vendor · certfrFR

also known as (5)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu cert_bund osv certfr NVD CVE.org MITRE

published 2026-06-12modified 2026-09-28

references (10)

External citations — patches, advisories, analysis.

scry

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