{"cve":{"cve_id":"CVE-2026-46340","is_kev":false,"kev_date_added":null,"kev_vendor_project":null,"kev_product":null,"kev_vulnerability_name":null,"kev_short_description":null,"kev_required_action":null,"kev_due_date":null,"kev_known_ransomware":null,"kev_notes":null,"kev_cwes":null,"epss_score":0.00335,"epss_percentile":0.25133,"epss_as_of":"2026-06-23","description":"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.","published_at":"2026-06-12T14:19:48.855000Z","last_modified_at":null,"cvss_v3_score":7.5,"cvss_v3_vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cvss_v3_severity":"HIGH","cvss_v4_score":null,"cvss_v4_vector":null,"cvss_v4_severity":null,"ssvc_decision":null,"ssvc_exploitation":null,"ssvc_automatable":null,"ssvc_technical_impact":null,"cwes":["CWE-770"],"nvd_references":["https://github.com/netty/netty/security/advisories/GHSA-5xrh-qmmq-w6ch","https://github.com/netty/netty/releases/tag/netty-4.1.135.Final","https://github.com/netty/netty/releases/tag/netty-4.2.15.Final"],"vuln_status":null,"trending_score":null,"is_trending":false,"has_trended":false,"trended_number_one":false,"trending_peak_score":null,"trending_peak_rank":null,"started_trending_at":null,"trended_number_one_at":null,"summary_generated":null,"summary_generated_at":null,"summary_model":null,"created_at":"2026-06-24T00:09:39.878444Z","updated_at":"2026-06-28T23:30:38.004927Z"},"effective_severity":"HIGH","badges":[],"impact_analysis":[],"cvss_v3_decoded":{"version":"3.1","metrics":[{"metric":"AV","name":"Attack Vector","value":"N","value_label":"Network"},{"metric":"AC","name":"Attack Complexity","value":"L","value_label":"Low"},{"metric":"PR","name":"Privileges Required","value":"N","value_label":"None"},{"metric":"UI","name":"User Interaction","value":"N","value_label":"None"},{"metric":"S","name":"Scope","value":"U","value_label":"Unchanged"},{"metric":"C","name":"Confidentiality","value":"N","value_label":"None"},{"metric":"I","name":"Integrity","value":"N","value_label":"None"},{"metric":"A","name":"Availability","value":"H","value_label":"High"}]},"cvss_v4_decoded":{"version":null,"metrics":[]},"affected":[{"vendor_slug":"netty","vendor_name":"netty","product_slug":"netty","product_name":"netty","version_start":">= 4.2.0.Final, < 4.2.15.Final","version_start_inclusive":true,"version_end":">= 4.2.0.Final, < 4.2.15.Final","version_end_inclusive":true,"cpe23_uri":"cve5:netty:netty:>= 4.2.0.Final, < 4.2.15.Final:>= 4.2.0.Final, < 4.2.15.Final"},{"vendor_slug":"netty","vendor_name":"netty","product_slug":"netty","product_name":"netty","version_start":"< 4.1.135.Final","version_start_inclusive":true,"version_end":"< 4.1.135.Final","version_end_inclusive":true,"cpe23_uri":"cve5:netty:netty:< 4.1.135.Final:< 4.1.135.Final"}],"exploit_refs":[],"news":[],"references":[{"url":"https://github.com/netty/netty/security/advisories/GHSA-5xrh-qmmq-w6ch","source_type":"VENDOR_ADVISORY","tags":["advisory"]},{"url":"https://github.com/netty/netty/releases/tag/netty-4.1.135.Final","source_type":"PATCH","tags":["patch"]},{"url":"https://github.com/netty/netty/releases/tag/netty-4.2.15.Final","source_type":"PATCH","tags":["patch"]}],"timeline":[{"type":"published","at":"2026-06-12T14:19:48.855000Z","label":"CVE published","source":null},{"type":"cvss_changed","at":"2026-06-28T17:54:49.174395Z","label":"CVSS score revised","source":"cvelistv5"},{"type":"cvss_changed","at":"2026-06-28T17:54:49.174395Z","label":"CVSS score revised","source":"cvelistv5"},{"type":"cvss_changed","at":"2026-06-28T17:54:49.174395Z","label":"CVSS score revised","source":"cvelistv5"}]}