A flaw was found in Netty's MqttDecoder. (CVE-2026-93575)
A vulnerability in Netty's MqttDecoder allows an unauthenticated remote attacker to send a specially crafted MQTT CONNECT packet that bypasses size validation checks. This flaw causes excessive memory and CPU consumption, leading to a denial of service (DoS) via an OutOfMemoryError. The issue affects multiple specific versions of Netty. The CVSS score is 7.5, indicating a medium severity level.
AI Analysis
Technical Summary
CVE-2026-93575 is a vulnerability in Netty's MqttDecoder where the decoder fails to properly validate the 'Properties Length' field against the 'Remaining Length' in an MQTT CONNECT packet. This improper validation allows an attacker to bypass size limits, resulting in excessive memory and CPU resource consumption. The consequence is a denial of service due to an OutOfMemoryError. The vulnerability can be exploited remotely without authentication by sending a crafted MQTT CONNECT packet.
Potential Impact
The vulnerability leads to denial of service by exhausting memory and CPU resources on the affected system, causing an OutOfMemoryError. There is no impact on confidentiality or integrity reported. The attack requires no privileges or user interaction and can be performed remotely.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or patch links are provided in the available data. Until a patch is available, consider limiting exposure of MQTT services to untrusted networks and applying network-level protections to mitigate potential exploitation.
A flaw was found in Netty's MqttDecoder. (CVE-2026-93575)
Description
A vulnerability in Netty's MqttDecoder allows an unauthenticated remote attacker to send a specially crafted MQTT CONNECT packet that bypasses size validation checks. This flaw causes excessive memory and CPU consumption, leading to a denial of service (DoS) via an OutOfMemoryError. The issue affects multiple specific versions of Netty. The CVSS score is 7.5, indicating a medium severity level.
CVSS v3.1
Score 7.5high
Affected software
pkg:deb/ubuntu/netty?arch=source&distro=esm-infra-legacy/trustypkg:deb/ubuntu/netty?arch=source&distro=esm-apps-legacy/xenialpkg:deb/ubuntu/netty?arch=source&distro=esm-apps/bionicpkg:deb/ubuntu/netty?arch=source&distro=esm-apps/focalpkg:deb/ubuntu/netty?arch=source&distro=esm-apps/jammypkg:deb/ubuntu/netty?arch=source&distro=esm-apps/noblepkg:deb/ubuntu/netty?arch=source&distro=esm-apps/resoluteRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-93575 is a vulnerability in Netty's MqttDecoder where the decoder fails to properly validate the 'Properties Length' field against the 'Remaining Length' in an MQTT CONNECT packet. This improper validation allows an attacker to bypass size limits, resulting in excessive memory and CPU resource consumption. The consequence is a denial of service due to an OutOfMemoryError. The vulnerability can be exploited remotely without authentication by sending a crafted MQTT CONNECT packet.
Potential Impact
The vulnerability leads to denial of service by exhausting memory and CPU resources on the affected system, causing an OutOfMemoryError. There is no impact on confidentiality or integrity reported. The attack requires no privileges or user interaction and can be performed remotely.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or patch links are provided in the available data. Until a patch is available, consider limiting exposure of MQTT services to untrusted networks and applying network-level protections to mitigate potential exploitation.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2026-93575
- Osv Schema Version
- 1.7.0
- Ecosystems
- ["Ubuntu:Pro:14.04:LTS","Ubuntu:Pro:16.04:LTS","Ubuntu:Pro:18.04:LTS","Ubuntu:Pro:20.04:LTS","Ubuntu:Pro:22.04:LTS","Ubuntu:Pro:24.04:LTS","Ubuntu:Pro:26.04:LTS"]
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6ab4be2ef7a7c54106eeec1a
Added to database: 09/24/2026, 06:07:42 UTC
Last enriched: 09/24/2026, 06:25:44 UTC
Last updated: 09/24/2026, 09:47:34 UTC
Views: 3
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