CVE-2026-44248 (GCVE-0-2026-44248)

Vulnerability from cvelistv5 – Published: 2026-05-13 18:23 – Updated: 2026-08-03 12:05
VLAI
Title
Netty: Resource exhaustion in MqttDecoder
Summary
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.
Severity
5.3 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-05-13 19:11 UTC
CWE
  • CWE-400 - Uncontrolled Resource Consumption
  • CWE-770 - Allocation of Resources Without Limits or Throttling
Assigner
References
Impacted products
Vendor Product Version
netty netty Affected: >= 4.2.0.Alpha1, < 4.2.13.Final
Affected: < 4.1.133.Final
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io.netty netty-codec-mqtt Affected: >= 4.2.0.Alpha1, < 4.2.13.Final
Affected: < 4.1.133.Final
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Red Hat Red Hat build of Apache Camel 4.18.1.P1 for Spring Boot 3.5.16 Unaffected: codec-mqtt , < * (rpm)
    cpe:/a:redhat:apache_camel_spring_boot:4.18
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Red Hat Red Hat Data Grid 8.6.2 Unaffected: codec-mqtt , < * (rpm)
    cpe:/a:redhat:jboss_data_grid:8
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Red Hat Red Hat AMQ Broker 7     cpe:/a:redhat:amq_broker:7
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Red Hat Red Hat Fuse 7     cpe:/a:redhat:jboss_fuse:7
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Red Hat Red Hat JBoss Enterprise Application Platform 7     cpe:/a:redhat:jboss_enterprise_application_platform:7
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Red Hat Red Hat JBoss Enterprise Application Platform Expansion Pack     cpe:/a:redhat:jbosseapxp
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Red Hat Red Hat Process Automation 7     cpe:/a:redhat:jboss_enterprise_bpms_platform:7
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Red Hat Red Hat Single Sign-On 7     cpe:/a:redhat:red_hat_single_sign_on:7
 Create a notification for this product.
Show details on NVD website
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      "cve": "CVE-2026-44248",
      "id": "CVE-2026-44248",
      "initial_release_date": "2026-05-15T01:58:08Z",
      "product_status:known_not_affected": "42",
      "product_status:recommended": "22",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-44248",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-44248.json",
      "version": "4"
    },
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      "cveMetadata": "{\"cveId\": \"CVE-2026-44248\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-03T12:05:42.907Z\", \"dateReserved\": \"2026-05-05T16:33:55.844Z\", \"assignerOrgId\": \"a0819718-46f1-4df5-94e2-005712e83aaa\", \"datePublished\": \"2026-05-13T18:23:37.563Z\", \"assignerShortName\": \"GitHub_M\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.