PT-2026-38399 · Netty · Netty
Published
2026-05-07
·
Updated
2026-06-11
·
CVE-2026-44248
CVSS v3.1
7.5
High
| Vector | AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
Name of the Vulnerable Software and Affected Versions
Netty (affected versions not specified)
Description
Resource exhaustion occurs because the MQTT 5 header Properties section is parsed and buffered before any message size limit is applied. In the
MqttDecoder class, the decodeVariableHeader() function is executed before the check for bytesRemainingBeforeVariableHeader > maxBytesInMessage. This allows decodeVariableHeader() to trigger decodeProperties(), meaning no limits are applied to the size of the decoded properties. Since MqttDecoder extends ReplayingDecoder, the system repeatedly re-parses and buffers large Properties sections in memory until parsing is complete, leading to high CPU and memory consumption.Recommendations
At the moment, there is no information about a newer version that contains a fix for this vulnerability.
DoS
Resource Exhaustion
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Weakness Enumeration
Related Identifiers
Affected Products
Netty