CVE-2026-44248

highpriority · track · 30EPSS 0.006 · 47 %ileDEEUFRNLRUUS

grimoire priorityP2 · Scheduled

Exploitable?

—

no known exploitation

Likely / severe?

0.56% (47th) EPSS

CVSS 7.5 · high

Is it mine?

52 products

Check your exposure

Who says so?

7 sources

cnnvd · enisa_euvd · fstec_bdu · cert_bund

EPSS · scored 2026-10-26

Netty is an asynchronous, event-driven network application framework. Prior to 4.2.13.Final and 4.1.133.Final, the MQTT 5 header Properties section is parsed and buffered before any message size limit is applied. Specifically, in MqttDecoder, the decodeVariableHeader() method is called before the bytesRemainingBeforeVariableHeader > maxBytesInMessage check. The decodeVariableHeader() can call other methods which will call decodeProperties(). Effectively, Netty does not apply any limits to the size of the properties being decoded. Additionally, because MqttDecoder extends ReplayingDecoder, Netty will repeatedly re-parse the enormous Properties sections and buffer the bytes in memory, until the entire thing parses to completion. This can cause high resource usage in both CPU and memory. This vulnerability is fixed in 4.2.13.Final and 4.1.133.Final.

cvss

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

7.5

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 5.3–7.5

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hprimary · NVD / NIST USexploitability 3.9 · impact 3.6

v3.17.5highAV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hsecondary · 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

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hsecondaryexploitability 3.9 · impact 3.6

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

v3.16.9mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:Usecondary · CVSS-BT (t0sche)

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hsecondary · NCSC-NL NL

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-400USCWE-770USCWE-770USCWE-770US

affected products (52)

Products and version ranges known to be affected.

IBM DB2all versionscert_bundDEcpe:/a:ibm:db2:-
IBM SPSS Analytic Serverall versionscert_bundDEcpe:/a:ibm:spss:analytic_server
IBM Spectrum Scaleall versionscert_bundDEcpe:/a:ibm:spectrum_scale:-
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
Red Hat JBoss Enterprise Application Platformall versionscert_bundDEcpe:/a:redhat:jboss_enterprise_application_platform:-
SUSE Linuxall versionscert_bundDEcpe:/o:suse:suse_linux:-
Ubuntu Linuxall versionscert_bundDEcpe:/o:canonical:ubuntu_linux:-
Absolute Absolute Secure Access <14.60< 14.60cert_bundDE
Absolute Secure Access< 14.60cert_bundDE
IBM Cognos Analytics< 12.0.4 FP3cert_bundDE
IBM Cognos Analytics< 12.1.3 FP2cert_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 Planning Analytics Local <2.1.22≤ Local <2.1.22cert_bundDE
IBM Planning Analytics≤ Local <2.1.22cert_bundDE
Open Source Keycloak< 26.6.3cert_bundDE
Open Source Netty< 4.1.133.Finalcert_bundDE
Open Source Netty< 4.2.13.Finalcert_bundDE
Open Source Open Source Keycloak <26.6.3< 26.6.3cert_bundDE

showing 20 of 52

advisories (5)

Vendor and ecosystem advisories describing this.

NCSC-2026-0258Kwetsbaarheden verholpen in Oracle Financial ServicesNL2026-07-22csaf · ncsc_nlNL
Oracle heeft kwetsbaarheden verholpen in diverse Financial Services modules. Ook heeft Oracle updates voor diverse third-party-producten verwerkt.
WID-SEC-W-2026-1372Netty: Mehrere SchwachstellenDeutsch2026-05-05csaf · cert_bundDE
Ein entfernter, anonymer Angreifer kann mehrere Schwachstellen in Netty ausnutzen, um Sicherheitsmaßnahmen zu umgehen, Daten zu manipulieren, vertrauliche Informationen offenzulegen oder einen Denial-of-Service-Zustand zu verursachen.
WID-SEC-W-2026-2445Oracle Financial Services Applications: Mehrere SchwachstellenDeutsch2026-07-21csaf · cert_bundDE
Ein entfernter, anonymer oder authentisierter Angreifer kann mehrere Schwachstellen in Oracle Financial Services Applications ausnutzen, um die Vertraulichkeit, Integrität und Verfügbarkeit zu gefährden.
GHSA-jfg9-48mv-9qgxNetty MQTT: Resource exhaustion in MqttDecoder2026-05-07ghsa · osvUS
### Impact The MQTT 5 header Properties section is parsed and buffered _before_ any message size limit is applied. Specifically, in `MqttDecoder`, the `decodeVariableHeader()` method is called before the `bytesRemainingBeforeVariableHeader > maxBytesInMessage` check. The `decodeVariableHeader()` can call other methods which will call `decodeProperties()`. Effectively, Netty does not apply any limits to the size of the properties being decoded. Additionally, because `MqttDecoder` extends `ReplayingDecoder`, Netty will repeatedly re-parse the enormous Properties sections and buffer the bytes in memory, until the entire thing parses to completion. This can cause high resource usage in both CPU and memory. ### Resources `ANT-2026-09608` https://docs.oasis-open.org/mqtt/mqtt/v5.0/os/mqtt-v5.0-os.html#_Toc3901027
CERTFR-2026-AVI-1385Multiples vulnérabilités dans les produits VMwareFrançais2026-10-26vendor · certfrFR

also known as (4)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu cert_bund ncsc_nl osv certfr NVD CVE.org MITRE

published 2026-05-13modified 2026-10-26

references (11)

External citations — patches, advisories, analysis.

scry

Attackers weaponise vulnerabilities like this against internet-exposed services. See what is exposed on your perimeter with a free passive scan.

Free scan