{"id":"CVE-2026-19204","details":"A client may send a WebSocket frame with an unknown opcode and a very large declared payload length, causing Jetty to attempt a large memory allocation and potentially exhaust the JVM heap.\n\n\n\n\nThis occurs when auto-fragmentation is enabled, as unknown opcodes bypass the normal maximum frame size handling and payload allocation occurs before the opcode is validated.","aliases":["GHSA-85fq-fc5f-7j7g"],"modified":"2026-09-09T03:30:44.196365847Z","published":"2026-09-07T10:19:24.186Z","database_specific":{"cwe_ids":["CWE-770","CWE-789"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/19xxx/CVE-2026-19204.json","unresolved_ranges":[{"source":"AFFECTED_FIELD","extracted_events":[{"introduced":"11.0.0"},{"last_affected":"11.0.31"},{"introduced":"10.0.0"},{"last_affected":"10.0.31"}]}],"cna_assigner":"eclipse"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/19xxx/CVE-2026-19204.json"},{"type":"ADVISORY","url":"https://github.com/jetty/jetty.project/security/advisories/GHSA-85fq-fc5f-7j7g"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-19204"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/jetty/jetty.project","events":[{"introduced":"c8372b65bd15404de1444d68902c0455a3a69b64"},{"last_affected":"6c1ced3f077bc633716c54758a743b09b21328e8"},{"introduced":"28100e8da711e44c0722ed10bd413ae862497539"},{"last_affected":"ceb2461aabfc7e4f362f2602ea2eeb5bd67599db"}],"database_specific":{"source":"AFFECTED_FIELD","extracted_events":[{"introduced":"12.1.0"},{"last_affected":"12.1.11"},{"introduced":"12.0.0"},{"last_affected":"12.0.37"}]}}],"versions":["jetty-12.1.11","jetty-12.0.37","jetty-12.1.5","jetty-12.0.31","jetty-12.1.4","jetty-12.0.30","jetty-12.1.2","jetty-12.0.23","jetty-12.1.0.beta1","jetty-12.0.22","jetty-12.0.19","jetty-12.0.15","jetty-12.0.14","jetty-12.0.6","jetty-12.0.5","jetty-12.0.0x"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-19204.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"}]}