{"id":"CVE-2026-46340","title":"Netty is a network application framework for development of protocol servers and clients","summary":"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…","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-770"],"vendor":"netty","product":"netty","affected":["netty < 4.1.135","netty >= 4.2.0, < 4.2.15"],"patched":["netty 4.2.15"],"published":"2026-06-12","updated":"2026-09-18","sourceUpdated":"2026-09-18T13:18:27.540","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-46340","references":[{"url":"https://github.com/netty/netty/releases/tag/netty-4.1.135.Final","label":"security-advisories@github.com"},{"url":"https://github.com/netty/netty/releases/tag/netty-4.2.15.Final","label":"security-advisories@github.com"},{"url":"https://github.com/netty/netty/security/advisories/GHSA-5xrh-qmmq-w6ch","label":"security-advisories@github.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:37390","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:41951","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:50085","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:53644","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:53645","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:53646","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/security/cve/CVE-2026-46340","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2488388","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-46340.json","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:53806","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-46340"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-46340"},{"url":"https://github.com/advisories/GHSA-5xrh-qmmq-w6ch"}],"tags":["nvd","cve.org","csaf","vex","red-hat","ghsa","maven"],"epss":0.00606,"epssPercentile":0.47392,"aliases":["GHSA-5xrh-qmmq-w6ch"],"ecosystem":"maven","ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"partial","timestamp":"2026-06-12T16:30:59.578272Z"},"ingestedAt":"2026-07-07T15:41:59.852Z","slug":"CVE-2026-46340","body":"## Overview\n\nNetty 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.\n\n## Affected\n\n- `netty < 4.1.135`\n- `netty >= 4.2.0, < 4.2.15`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `netty 4.2.15`\n\n## Package advisory (CVE-2026-46340)\n\nAffected packages:\n\n- `io.netty:netty-transport-sctp >= 4.2.0.Final, <= 4.2.14.Final`\n- `io.netty:netty-transport-sctp <= 4.1.134.Final`\n\nPatched in:\n\n- `io.netty:netty-transport-sctp 4.2.15.Final`\n- `io.netty:netty-transport-sctp 4.1.135.Final`\n\nSource: https://github.com/advisories/GHSA-5xrh-qmmq-w6ch\n\n## Vendor advisories\n\n- **RHSA-2026:53644** · Red Hat · fixed in: Red Hat JBoss EAP 7.4 ELS for RHEL 7 Server · released 2026-08-11 · [advisory](https://access.redhat.com/errata/RHSA-2026:53644)\n- **RHSA-2026:41951** · Red Hat · fixed in: Red Hat Data Grid 8.6.2 · released 2026-07-20 · [advisory](https://access.redhat.com/errata/RHSA-2026:41951)\n- **RHSA-2026:53806** · Red Hat · fixed in: Red Hat JBoss Enterprise Application Platform 7.4.25 · released 2026-08-11 · [advisory](https://access.redhat.com/errata/RHSA-2026:53806)\n- **RHSA-2026:50085** · Red Hat · fixed in: Red Hat JBoss Enterprise Application Platform 8.1 · released 2026-08-04 · [advisory](https://access.redhat.com/errata/RHSA-2026:50085)\n- **RHSA-2026:37390** · Red Hat · fixed in: Red Hat build of Apache Camel 4.18.1.P1 for Spring Boot 3.5.16 · released 2026-07-09 · [advisory](https://access.redhat.com/errata/RHSA-2026:37390)\n- **Red Hat VEX** · Important · affected: Red Hat Fuse 7, Red Hat JBoss Enterprise Application Platform Expansion Pack · no fix planned: Red Hat Fuse 7, Red Hat JBoss Enterprise Application Platform Expansion Pack · updated 2026-09-17 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-46340.json)\n- **RHSA-2026:53645** · Red Hat · fixed in: Red Hat JBoss EAP 7.4 ELS for RHEL 8 · released 2026-08-11 · [advisory](https://access.redhat.com/errata/RHSA-2026:53645)\n- **RHSA-2026:53646** · Red Hat · fixed in: Red Hat JBoss EAP 7.4 ELS for RHEL 9 · released 2026-08-11 · [advisory](https://access.redhat.com/errata/RHSA-2026:53646)","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}