Vulnerability-Lookup

CVE-2026-93575 (GCVE-0-2026-93575)

Vulnerability from cvelistv5 – Published: 2026-09-18 10:53 – Updated: 2026-09-18 20:12

Title

Io.netty/netty-codec-mqtt: netty: resource exhaustion in mqttdecoder

Summary

A flaw was found in Netty's MqttDecoder. An unauthenticated remote attacker can exploit this vulnerability by sending a specially crafted MQTT CONNECT packet. The decoder fails to properly validate the 'Properties Length' against the 'Remaining Length', allowing an attacker to bypass size limits. This leads to excessive memory and CPU consumption, resulting in a denial of service (DoS) due to an OutOfMemoryError.

Severity

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CWE

CWE-1035

Assigner

redhat redhat root

References

2 references

URL	Tags
https://access.redhat.com/security/cve/CVE-2026-93575	vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2536967	issue-trackingx_refsource_REDHAT

Impacted products

5 products

Vendor	Product	Version
Red Hat	Red Hat AMQ Broker 7	cpe:/a:redhat:amq_broker:7
Red Hat	Red Hat build of Apache Camel for Spring Boot 4	cpe:/a:redhat:camel_spring_boot:4
Red Hat	Red Hat Fuse 7	cpe:/a:redhat:jboss_fuse:7
Red Hat	Red Hat JBoss Enterprise Application Platform 7	cpe:/a:redhat:jboss_enterprise_application_platform:7
Red Hat	Red Hat Single Sign-On 7	cpe:/a:redhat:red_hat_single_sign_on:7

Date Public

2026-09-10 00:53

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-93575

Vulnerability from fkie_nvd - Published: 2026-09-18 11:17 - Updated: 2026-09-18 11:17

Severity

Summary

### Summary Netty's fix for CVE-2026-44248 is incomplete. The decoder checks if the MQTT packet's `Remaining Length` exceeds `maxBytesInMessage`, but fails to validate the `Properties Length` against the `Remaining Length`. An attacker can bypass the size limit by sending a small `Remaining Length` but an enormous `Properties Length`. This forces Netty to buffer and parse millions of properties, allowing an unauthenticated remote attacker to trigger excessive memory and CPU consumption, leading to OutOfMemoryError. ### Details In `io.netty.handler.codec.mqtt.MqttDecoder`, the `decodeProperties()` helper method reads `totalPropertiesLength` and attempts to parse that many bytes. If the buffer lacks the full length, a `Signal` is thrown. The `catch` block inside `decode()` only enforces `maxBytesInMessage` against `bytesRemainingBeforeVariableHeader` (the packet's `Remaining Length`). By sending a `CONNECT` packet with a small `Remaining Length` but a huge `Properties Length`, the size check passes. `ReplayingDecoder` then buffers data from the network until the huge `Properties Length` is reached, parsing millions of `UserProperty` objects and exhausting CPU and memory. #

References

	URL	Tags
	secalert@redhat.com	https://access.redhat.com/security/cve/CVE-2026-93575
	secalert@redhat.com	https://bugzilla.redhat.com/show_bug.cgi?id=2536967

Impacted products

	Vendor	Product	Version

JSON

To clipboard

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}

GHSA-FCR3-V77C-X7HX

Vulnerability from github – Published: 2026-09-18 12:31 – Updated: 2026-09-18 15:32

Details

Summary

Netty's fix for CVE-2026-44248 is incomplete. The decoder checks if the MQTT packet's Remaining Length exceeds maxBytesInMessage, but fails to validate the Properties Length against the Remaining Length. An attacker can bypass the size limit by sending a small Remaining Length but an enormous Properties Length. This forces Netty to buffer and parse millions of properties, allowing an unauthenticated remote attacker to trigger excessive memory and CPU consumption, leading to OutOfMemoryError.

Details

In io.netty.handler.codec.mqtt.MqttDecoder, the decodeProperties() helper method reads totalPropertiesLength and attempts to parse that many bytes. If the buffer lacks the full length, a Signal is thrown. The catch block inside decode() only enforces maxBytesInMessage against bytesRemainingBeforeVariableHeader (the packet's Remaining Length).

By sending a CONNECT packet with a small Remaining Length but a huge Properties Length, the size check passes. ReplayingDecoder then buffers data from the network until the huge Properties Length is reached, parsing millions of UserProperty objects and exhausting CPU and memory.

Severity

7.5 (High)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Show details on source website

JSON

To clipboard

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    "nvd_published_at": "2026-09-18T11:17:22Z",
    "severity": "HIGH"
  },
  "details": "### Summary\nNetty\u0027s fix for CVE-2026-44248 is incomplete. The decoder checks if the MQTT packet\u0027s `Remaining Length` exceeds `maxBytesInMessage`, but fails to validate the `Properties Length` against the `Remaining Length`. An attacker can bypass the size limit by sending a small `Remaining Length` but an enormous `Properties Length`. This forces Netty to buffer and parse millions of properties, allowing an unauthenticated remote attacker to trigger excessive memory and CPU consumption, leading to OutOfMemoryError.\n\n### Details\nIn `io.netty.handler.codec.mqtt.MqttDecoder`, the `decodeProperties()` helper method reads `totalPropertiesLength` and attempts to parse that many bytes. If the buffer lacks the full length, a `Signal` is thrown. The `catch` block inside `decode()` only enforces `maxBytesInMessage` against `bytesRemainingBeforeVariableHeader` (the packet\u0027s `Remaining Length`).\n\nBy sending a `CONNECT` packet with a small `Remaining Length` but a huge `Properties Length`, the size check passes. `ReplayingDecoder` then buffers data from the network until the huge `Properties Length` is reached, parsing millions of `UserProperty` objects and exhausting CPU and memory.\n\n#",
  "id": "GHSA-fcr3-v77c-x7hx",
  "modified": "2026-09-18T15:32:15Z",
  "published": "2026-09-18T12:31:20Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-93575"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/security/cve/CVE-2026-93575"
    },
    {
      "type": "WEB",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2536967"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

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Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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Action not permitted

CVE-2026-93575 (GCVE-0-2026-93575)

FKIE_CVE-2026-93575

GHSA-FCR3-V77C-X7HX

Summary

Details

Tags

Sightings

Nomenclature

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