{"document":{"category":"csaf_vex","csaf_version":"2.0","title":"CVE-2026-44892: Netty has a Vulnerable Default Configuration Which Leads to Denial of Service via Unbounded HTTP/3 Header Size","publisher":{"category":"vendor","name":"HarborGuard Database","namespace":"https://database.harborguard.co"},"tracking":{"id":"CVE-2026-44892","status":"final","version":"1","initial_release_date":"2026-06-12T05:04:58.033Z","current_release_date":"2026-06-12T09:59:06.667Z","revision_history":[{"date":"2026-06-12T05:04:58.033Z","number":"1","summary":"Initial machine-readable export from HarborGuard."}]},"distribution":{"tlp":{"label":"WHITE"},"text":"Public CVE data; freely redistributable."},"notes":[{"category":"description","text":"Netty is a network application framework for development of protocol servers and clients. Prior to version 4.2.15.Final, the default configuration of the `Http3ConnectionHandler` in the Netty HTTP/3 codec lacks an enforced maximum header size limit. When a peer does not explicitly specify `HTTP3_SETTINGS_MAX_FIELD_SECTION_SIZE`, the implementation defaults to an unbounded limit. This insecure default configuration allows a malicious client or server to send an enormous number of headers, leading to a memory exhaustion Denial of Service via an `OutOfMemoryError`. Version 4.2.15.Final contains a patch.","title":"CVE description"}],"references":[{"category":"self","summary":"CVE-2026-44892 on HarborGuard Database","url":"https://database.harborguard.co/cve/CVE-2026-44892"},{"category":"external","summary":"CVE Record","url":"https://www.cve.org/CVERecord?id=CVE-2026-44892"},{"category":"external","summary":"https://github.com/netty/netty/security/advisories/GHSA-c2rx-5r8w-8xr2","url":"https://github.com/netty/netty/security/advisories/GHSA-c2rx-5r8w-8xr2"},{"category":"external","summary":"https://github.com/netty/netty/releases/tag/netty-4.2.15.Final","url":"https://github.com/netty/netty/releases/tag/netty-4.2.15.Final"}]},"product_tree":{"branches":[{"category":"vendor","name":"netty","branches":[{"category":"product_name","name":"netty","branches":[{"category":"product_version","name":">= 4.2.0.Final, < 4.2.15.Final","product":{"name":"netty netty >= 4.2.0.Final, < 4.2.15.Final","product_id":"CSAFPID-1","product_identification_helper":{"cpe":"cpe:2.3:a:netty:netty:\\>\\=_4.2.0.final\\,_\\<_4.2.15.final:*:*:*:*:*:*:*"}}}]}]}]},"vulnerabilities":[{"cve":"CVE-2026-44892","title":"Netty has a Vulnerable Default Configuration Which Leads to Denial of Service via Unbounded HTTP/3 Header Size","notes":[{"category":"description","text":"Netty is a network application framework for development of protocol servers and clients. Prior to version 4.2.15.Final, the default configuration of the `Http3ConnectionHandler` in the Netty HTTP/3 codec lacks an enforced maximum header size limit. When a peer does not explicitly specify `HTTP3_SETTINGS_MAX_FIELD_SECTION_SIZE`, the implementation defaults to an unbounded limit. This insecure default configuration allows a malicious client or server to send an enormous number of headers, leading to a memory exhaustion Denial of Service via an `OutOfMemoryError`. Version 4.2.15.Final contains a patch.","title":"CVE description"}],"product_status":{"known_affected":["CSAFPID-1"]},"scores":[{"cvss_v3":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","baseScore":7.5,"baseSeverity":"HIGH"},"products":["CSAFPID-1"]}],"remediations":[{"category":"none_available","details":"No fixed version is published yet. Monitor the upstream advisory.","product_ids":["CSAFPID-1"]}]}]}