CVE-2026-44248

{"id": "CVE-2026-44248", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-44248", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-05-13T19:11:14.636780Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "security-advisories@github.com", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 5.3, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "LOW", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}, "impactScore": 1.4, "exploitabilityScore": 3.9}, {"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.5, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}, "impactScore": 3.6, "exploitabilityScore": 3.9}, {"type": "Secondary", "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.5, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}, "impactScore": 3.6, "exploitabilityScore": 3.9}]}, "affected": [{"source": "security-advisories@github.com", "affectedData": [{"vendor": "netty", "product": "netty", "versions": [{"status": "affected", "version": ">= 4.2.0.Alpha1, < 4.2.13.Final"}, {"status": "affected", "version": "< 4.1.133.Final"}]}, {"vendor": "io.netty", "product": "netty-codec-mqtt", "versions": [{"status": "affected", "version": ">= 4.2.0.Alpha1, < 4.2.13.Final"}, {"status": "affected", "version": "< 4.1.133.Final"}]}]}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "affectedData": [{"cpes": ["cpe:/a:redhat:amq_broker:7.13"], "vendor": "Red Hat", "product": "Red Hat AMQ Broker 7.13.6", "versions": [{"status": "unaffected", "version": "codec-mqtt", "lessThan": "*", "versionType": "rpm"}], "packageName": "netty", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "affected"}, {"cpes": ["cpe:/a:redhat:amq_broker:7.14"], "vendor": "Red Hat", "product": "Red Hat AMQ Broker 7.14.1", "versions": [{"status": "unaffected", "version": "codec-mqtt", "lessThan": "*", "versionType": "rpm"}], "packageName": "netty", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "affected"}, {"cpes": ["cpe:/a:redhat:apache_camel_spring_boot:4.18"], "vendor": "Red Hat", "product": "Red Hat build of Apache Camel 4.18.1.P1 for Spring Boot 3.5.16", "versions": [{"status": "unaffected", "version": "codec-mqtt", "lessThan": "*", "versionType": "rpm"}], "packageName": "netty", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "affected"}, {"cpes": ["cpe:/a:redhat:jboss_data_grid:8"], "vendor": "Red Hat", "product": "Red Hat Data Grid 8.6.2", "versions": [{"status": "unaffected", "version": "codec-mqtt", "lessThan": "*", "versionType": "rpm"}], "packageName": "netty", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "affected"}, {"cpes": ["cpe:/a:redhat:jboss_fuse:7"], "vendor": "Red Hat", "product": "Red Hat Fuse 7", "packageName": "netty-codec-mqtt", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "affected"}, {"cpes": ["cpe:/a:redhat:jboss_enterprise_application_platform:7"], "vendor": "Red Hat", "product": "Red Hat JBoss Enterprise Application Platform 7", "packageName": "netty-codec-mqtt", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "unaffected"}, {"cpes": ["cpe:/a:redhat:jbosseapxp"], "vendor": "Red Hat", "product": "Red Hat JBoss Enterprise Application Platform Expansion Pack", "packageName": "netty-codec-mqtt", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "unaffected"}, {"cpes": ["cpe:/a:redhat:jboss_enterprise_bpms_platform:7"], "vendor": "Red Hat", "product": "Red Hat Process Automation 7", "packageName": "netty-codec-mqtt", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "affected"}, {"cpes": ["cpe:/a:redhat:red_hat_single_sign_on:7"], "vendor": "Red Hat", "product": "Red Hat Single Sign-On 7", "packageName": "netty-codec-mqtt", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "unaffected"}]}], "published": "2026-05-13T19:17:27.143", "references": [{"url": "https://github.com/netty/netty/security/advisories/GHSA-jfg9-48mv-9qgx", "tags": ["Vendor Advisory"], "source": "security-advisories@github.com"}, {"url": "https://access.redhat.com/errata/RHSA-2026:37390", "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c"}, {"url": "https://access.redhat.com/errata/RHSA-2026:41951", "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c"}, {"url": "https://access.redhat.com/errata/RHSA-2026:66488", "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c"}, {"url": "https://access.redhat.com/errata/RHSA-2026:66545", "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c"}, {"url": "https://access.redhat.com/security/cve/CVE-2026-44248", "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c"}, {"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2477231", "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c"}, {"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-44248.json", "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c"}], "vulnStatus": "Modified", "weaknesses": [{"type": "Secondary", "source": "security-advisories@github.com", "description": [{"lang": "en", "value": "CWE-400"}]}, {"type": "Secondary", "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "description": [{"lang": "en", "value": "CWE-770"}]}], "descriptions": [{"lang": "en", "value": "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."}, {"lang": "es", "value": "Netty es un framework de aplicaci\u00f3n de red as\u00edncrono y basado en eventos. Antes de 4.2.13.Final y 4.1.133.Final, la secci\u00f3n de Propiedades del encabezado MQTT 5 se analiza y almacena en b\u00fafer antes de que se aplique cualquier l\u00edmite de tama\u00f1o de mensaje. Espec\u00edficamente, en MqttDecoder, el m\u00e9todo decodeVariableHeader() se llama antes de la comprobaci\u00f3n bytesRemainingBeforeVariableHeader > maxBytesInMessage. El decodeVariableHeader() puede llamar a otros m\u00e9todos que llamar\u00e1n a decodeProperties(). Efectivamente, Netty no aplica ning\u00fan l\u00edmite al tama\u00f1o de las propiedades que se est\u00e1n decodificando. Adem\u00e1s, debido a que MqttDecoder extiende ReplayingDecoder, Netty volver\u00e1 a analizar repetidamente las enormes secciones de Propiedades y almacenar\u00e1 los bytes en la memoria, hasta que todo se analice por completo. Esto puede causar un alto uso de recursos tanto en la CPU como en la memoria. Esta vulnerabilidad se corrige en 4.2.13.Final y 4.1.133.Final."}], "lastModified": "2026-10-26T17:10:03.270", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:netty:netty:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "DFE205A5-2C43-40C9-A2FF-CF6759B8D861", "versionEndExcluding": "4.1.133"}, {"criteria": "cpe:2.3:a:netty:netty:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "D94A720F-9CED-4BE9-8C37-FD9E2FD28472", "versionEndExcluding": "4.2.13", "versionStartIncluding": "4.2.0"}], "operator": "OR"}]}], "sourceIdentifier": "security-advisories@github.com"}