CVE-2026-46340

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-46340", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-05-13T18:37:30.990Z", "datePublished": "2026-06-12T14:19:48.855Z", "dateUpdated": "2026-09-18T12:04:51.463Z"}, "containers": {"cna": {"title": "Netty: SCTP reassembly nests buffers without bound", "problemTypes": [{"descriptions": [{"cweId": "CWE-770", "lang": "en", "description": "CWE-770: Allocation of Resources Without Limits or Throttling", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}}], "references": [{"name": "https://github.com/netty/netty/security/advisories/GHSA-5xrh-qmmq-w6ch", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/netty/netty/security/advisories/GHSA-5xrh-qmmq-w6ch"}, {"name": "https://github.com/netty/netty/releases/tag/netty-4.1.135.Final", "tags": ["x_refsource_MISC"], "url": "https://github.com/netty/netty/releases/tag/netty-4.1.135.Final"}, {"name": "https://github.com/netty/netty/releases/tag/netty-4.2.15.Final", "tags": ["x_refsource_MISC"], "url": "https://github.com/netty/netty/releases/tag/netty-4.2.15.Final"}], "affected": [{"vendor": "netty", "product": "netty", "versions": [{"version": ">= 4.2.0.Final, < 4.2.15.Final", "status": "affected"}, {"version": "< 4.1.135.Final", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-06-12T14:19:48.855Z"}, "descriptions": [{"lang": "en", "value": "Netty is a network application framework for development of protocol servers and clients. In versions of netty-transport-sctp prior to 4.1.135.Final and 4.2.15.Final, for each non-complete SctpMessage fragment the handler does `fragments.put(streamId, Unpooled.wrappedBuffer(frag, byteBuf))`, wrapping the previous accumulator and the new slice into a *new* CompositeByteBuf every time. After N fragments the accumulator is an N-deep chain of composites, each holding references and component arrays; readableBytes()/getBytes() on the final buffer recurse N levels. There is no limit on N, on total bytes, or on the number of streamIdentifiers an attacker can open (each gets its own map entry). A peer that never sets the `complete` flag can grow this structure indefinitely from tiny 1-byte DATA chunks. Versions 4.1.135.Final and 4.2.15.Final patch the issue."}], "source": {"advisory": "GHSA-5xrh-qmmq-w6ch", "discovery": "UNKNOWN"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-06-12T16:30:59.578272Z", "id": "CVE-2026-46340", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-06-12T16:31:09.511Z"}}, {"affected": [{"collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": ["cpe:/a:redhat:apache_camel_spring_boot:4.18"], "defaultStatus": "affected", "packageName": "netty", "product": "Red Hat build of Apache Camel 4.18.1.P1 for Spring Boot 3.5.16", "vendor": "Red Hat", "versions": [{"lessThan": "*", "status": "unaffected", "version": "transport-sctp", "versionType": "rpm"}]}, 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A remote attacker can exploit this vulnerability by sending specially crafted, non-complete Stream Control Transmission Protocol (SCTP) message fragments. This can lead to unbounded memory growth within the application, causing a Denial of Service (DoS) condition. The affected component fails to limit the size or number of these fragments, allowing an attacker to consume excessive system resources."}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-770", "description": "Allocation of Resources Without Limits or Throttling"}]}], "providerMetadata": {"orgId": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "shortName": "redhat-SADP", "dateUpdated": "2026-09-18T12:04:51.463Z"}}, {"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-46340", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-06-12T16:30:59.578272Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-06-12T16:31:04.916Z"}}], "cna": {"title": "Netty: SCTP reassembly nests buffers without bound", "source": {"advisory": "GHSA-5xrh-qmmq-w6ch", "discovery": "UNKNOWN"}, "metrics": [{"cvssV3_1": {"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"}}], "affected": [{"vendor": "netty", "product": "netty", "versions": [{"status": "affected", "version": ">= 4.2.0.Final, < 4.2.15.Final"}, {"status": "affected", "version": "< 4.1.135.Final"}]}], "references": [{"url": "https://github.com/netty/netty/security/advisories/GHSA-5xrh-qmmq-w6ch", "name": "https://github.com/netty/netty/security/advisories/GHSA-5xrh-qmmq-w6ch", "tags": ["x_refsource_CONFIRM"]}, {"url": "https://github.com/netty/netty/releases/tag/netty-4.1.135.Final", "name": "https://github.com/netty/netty/releases/tag/netty-4.1.135.Final", "tags": ["x_refsource_MISC"]}, {"url": "https://github.com/netty/netty/releases/tag/netty-4.2.15.Final", "name": "https://github.com/netty/netty/releases/tag/netty-4.2.15.Final", "tags": ["x_refsource_MISC"]}], "descriptions": [{"lang": "en", "value": "Netty is a network application framework for development of protocol servers and clients. 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Versions 4.1.135.Final and 4.2.15.Final patch the issue."}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-770", "description": "CWE-770: Allocation of Resources Without Limits or Throttling"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-06-12T14:19:48.855Z"}}}, "cveMetadata": {"cveId": "CVE-2026-46340", "state": "PUBLISHED", "dateUpdated": "2026-09-18T12:04:51.463Z", "dateReserved": "2026-05-13T18:37:30.990Z", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "datePublished": "2026-06-12T14:19:48.855Z", "assignerShortName": "GitHub_M"}, "dataVersion": "5.2"}

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In versions of netty-transport-sctp prior to 4.1.135.Final and 4.2.15.Final, for each non-complete SctpMessage fragment the handler does `fragments.put(streamId, Unpooled.wrappedBuffer(frag, byteBuf))`, wrapping the previous accumulator and the new slice into a *new* CompositeByteBuf every time. After N fragments the accumulator is an N-deep chain of composites, each holding references and component arrays; readableBytes()/getBytes() on the final buffer recurse N levels. There is no limit on N, on total bytes, or on the number of streamIdentifiers an attacker can open (each gets its own map entry). A peer that never sets the `complete` flag can grow this structure indefinitely from tiny 1-byte DATA chunks. Versions 4.1.135.Final and 4.2.15.Final patch the issue."}], "id": "CVE-2026-46340", "lastModified": "2026-09-18T13:18:27.540", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "security-advisories@github.com", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-46340", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-06-12T16:30:59.578272Z", "version": "2.0.3"}}]}, "published": "2026-06-12T15:16:27.743", "references": [{"source": "security-advisories@github.com", "tags": ["Release Notes"], "url": "https://github.com/netty/netty/releases/tag/netty-4.1.135.Final"}, {"source": "security-advisories@github.com", "tags": ["Release Notes"], "url": "https://github.com/netty/netty/releases/tag/netty-4.2.15.Final"}, {"source": "security-advisories@github.com", "tags": ["Vendor Advisory"], "url": "https://github.com/netty/netty/security/advisories/GHSA-5xrh-qmmq-w6ch"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "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-2026:50085"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://access.redhat.com/errata/RHSA-2026:53644"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://access.redhat.com/errata/RHSA-2026:53645"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://access.redhat.com/errata/RHSA-2026:53646"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://access.redhat.com/security/cve/CVE-2026-46340"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2488388"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-46340.json"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-770"}], "source": "security-advisories@github.com", "type": "Secondary"}, {"description": [{"lang": "en", "value": "CWE-770"}], "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "type": "Secondary"}]}

{"bugzilla": {"description": "netty-transport-sctp: Netty-transport-sctp: Denial of Service due to unbounded memory growth from SctpMessage fragments", "id": "2488388", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2488388"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-770", "details": ["Netty is a network application framework for development of protocol servers and clients. In versions of netty-transport-sctp prior to 4.1.135.Final and 4.2.15.Final, for each non-complete SctpMessage fragment the handler does `fragments.put(streamId, Unpooled.wrappedBuffer(frag, byteBuf))`, wrapping the previous accumulator and the new slice into a *new* CompositeByteBuf every time. After N fragments the accumulator is an N-deep chain of composites, each holding references and component arrays; readableBytes()/getBytes() on the final buffer recurse N levels. There is no limit on N, on total bytes, or on the number of streamIdentifiers an attacker can open (each gets its own map entry). A peer that never sets the `complete` flag can grow this structure indefinitely from tiny 1-byte DATA chunks. Versions 4.1.135.Final and 4.2.15.Final patch the issue.", "A flaw was found in netty-transport-sctp. A remote attacker can exploit this vulnerability by sending specially crafted, non-complete Stream Control Transmission Protocol (SCTP) message fragments. This can lead to unbounded memory growth within the application, causing a Denial of Service (DoS) condition. The affected component fails to limit the size or number of these fragments, allowing an attacker to consume excessive system resources."], "mitigation": {"lang": "en:us", "value": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability."}, "name": "CVE-2026-46340", "package_state": [{"cpe": "cpe:/a:redhat:camel_spring_boot:4", "fix_state": "Affected", "package_name": "netty-transport-sctp", "product_name": "Red Hat build of Apache Camel for Spring Boot 4"}, {"cpe": "cpe:/a:redhat:jboss_data_grid:8", "fix_state": "Affected", "package_name": "netty-transport-sctp", "product_name": "Red Hat Data Grid 8"}, {"cpe": "cpe:/a:redhat:enterprise_linux_ai:3", "fix_state": "Not affected", "package_name": "bazel6", "product_name": "Red Hat Enterprise Linux AI (RHEL AI) 3"}, {"cpe": "cpe:/a:redhat:jboss_fuse:7", "fix_state": "Affected", "package_name": "netty-transport-sctp", "product_name": "Red Hat Fuse 7"}, {"cpe": "cpe:/a:redhat:jboss_enterprise_application_platform:7", "fix_state": "Affected", "package_name": "netty-transport-sctp", "product_name": "Red Hat JBoss Enterprise Application Platform 7"}, {"cpe": "cpe:/a:redhat:jbosseapxp", "fix_state": "Affected", "package_name": "netty-transport-sctp", "product_name": "Red Hat JBoss Enterprise Application Platform Expansion Pack"}, {"cpe": "cpe:/a:redhat:red_hat_single_sign_on:7", "fix_state": "Affected", "package_name": "netty-transport-sctp", "product_name": "Red Hat Single Sign-On 7"}], "public_date": "2026-06-12T14:19:48Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-46340\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-46340\nhttps://github.com/netty/netty/releases/tag/netty-4.1.135.Final\nhttps://github.com/netty/netty/releases/tag/netty-4.2.15.Final\nhttps://github.com/netty/netty/security/advisories/GHSA-5xrh-qmmq-w6ch"], "statement": "An Important denial of service flaw exists in `netty-transport-sctp`, a component used across various Red Hat products. A remote, unauthenticated attacker can exploit this vulnerability by sending fragmented Stream Control Transmission Protocol (SCTP) messages without the completion flag. This leads to unbounded memory growth and resource exhaustion, causing a complete denial of service for applications utilizing the affected Netty component.", "threat_severity": "Important"}

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