{"id":"CVE-2026-19204","state":"PUBLISHED","title":"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 ","description":"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.","publishedAt":"2026-09-07T10:19:24.186Z","updatedAt":"2026-09-08T15:06:46.810Z","severity":{"score":8.7,"label":"High","version":"4.0","vector":"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","source":"eclipse"},"assigner":"eclipse","products":["Eclipse Foundation Eclipse Jetty"],"affected":[{"vendor":"Eclipse Foundation","product":"Eclipse Jetty","defaultStatus":"unaffected","versions":[{"version":"12.1.0","status":"affected","lessThanOrEqual":"12.1.11","versionType":"semver"},{"version":"12.0.0","status":"affected","lessThanOrEqual":"12.0.37","versionType":"semver"},{"version":"11.0.0","status":"affected","lessThanOrEqual":"11.0.31","versionType":"semver"},{"version":"10.0.0","status":"affected","lessThanOrEqual":"10.0.31","versionType":"semver"}]}],"references":["https://github.com/jetty/jetty.project/security/advisories/GHSA-85fq-fc5f-7j7g"],"weaknesses":["CWE-770","CWE-789"],"ingestedAt":"2026-10-29T20:11:10.572Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/19xxx/CVE-2026-19204.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-19204","state":"PUBLISHED","datePublished":"2026-09-07T10:19:24.186Z","dateUpdated":"2026-09-08T15:06:46.810Z","assignerShortName":"eclipse","assignerOrgId":"e51fbebd-6053-4e49-959f-1b94eeb69a2c","dateReserved":"2026-08-07T07:33:05.744Z"},"containers":{"cna":{"descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"Eclipse Foundation","product":"Eclipse Jetty","defaultStatus":"unaffected","versions":[{"version":"12.1.0","status":"affected","lessThanOrEqual":"12.1.11","versionType":"semver"},{"version":"12.0.0","status":"affected","lessThanOrEqual":"12.0.37","versionType":"semver"},{"version":"11.0.0","status":"affected","lessThanOrEqual":"11.0.31","versionType":"semver"},{"version":"10.0.0","status":"affected","lessThanOrEqual":"10.0.31","versionType":"semver"}]}],"references":[{"url":"https://github.com/jetty/jetty.project/security/advisories/GHSA-85fq-fc5f-7j7g"}],"metrics":[{"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}],"cvssV4_0":{"attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"NONE","userInteraction":"NONE","vulnConfidentialityImpact":"NONE","subConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE","subIntegrityImpact":"NONE","vulnAvailabilityImpact":"HIGH","subAvailabilityImpact":"NONE","exploitMaturity":"NOT_DEFINED","Safety":"NOT_DEFINED","Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","valueDensity":"NOT_DEFINED","vulnerabilityResponseEffort":"NOT_DEFINED","providerUrgency":"NOT_DEFINED","version":"4.0","baseSeverity":"HIGH","baseScore":8.7,"vectorString":"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"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-770","lang":"en","description":"CWE-770 Allocation of resources without limits or throttling","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-789","lang":"en","description":"CWE-789 Memory allocation with excessive size value","type":"CWE"}]}],"providerMetadata":{"shortName":"eclipse","orgId":"e51fbebd-6053-4e49-959f-1b94eeb69a2c","dateUpdated":"2026-09-07T10:19:24.186Z"},"credits":[{"lang":"en","value":"Arthur Chan","type":"reporter"},{"lang":"en","value":"David Korczynski","type":"reporter"},{"lang":"en","value":"Adam Korcz","type":"reporter"}],"source":{"discovery":"UNKNOWN"},"x_generator":{"engine":"Vulnogram 1.0.5"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-09-08T15:06:34.664874Z","id":"CVE-2026-19204","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-09-08T15:06:46.810Z"}}]}}}