Detections
Analytics

SCA: security update for io.netty:netty-codec-mqtt (GHSA-jfg9-48mv-9qgx)

high Tenable Self-Hosted Container Security Plugin ID 441434

Description

There are packages installed that are affected by a vulnerability referenced in the following CVE:

 - 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. (CVE-2026-44248)

Solution

Update the io.netty:netty-codec-mqtt library and its related packages to version 4.1.133.Final or later.

See Also

https://github.com/advisories/GHSA-jfg9-48mv-9qgx

Plugin Details

Severity: High

ID: 441434

Version: Revision 1.7

Type: Local

Family: SCA Checks

Published: 5/7/2026

Updated: 7/2/2026

Supported Sensors: Tenable Cloud Security, Tenable Self-Hosted Container Security

Risk Information

VPR

Risk Factor: Low

Score: 3

Percentile: 23.76

Vendor

Vendor Severity: Medium

CVSS v2

Risk Factor: High

Base Score: 7.8

Temporal Score: 5.8

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:C

CVSS Score Source: CVE-2026-44248

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

Exploit Ease: No known exploits are available

Patch Publication Date: 5/7/2026

Vulnerability Publication Date: 5/7/2026

Reference Information

CVE: CVE-2026-44248

cwe: CWE-400