# CVE-2026-19204

## Summary

- **CVE ID:** CVE-2026-19204
- **Severity:** HIGH
- **CVSS Score:** 8.7 (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)
- **CWE:** CWE-770, CWE-789
- **Published:** Sep 7, 2026
- **Last Modified:** Sep 8, 2026

## 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.




This 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 Products

- Eclipse Foundation — Eclipse Jetty (12.1.0)
- Eclipse Foundation — Eclipse Jetty (12.0.0)
- Eclipse Foundation — Eclipse Jetty (11.0.0)
- Eclipse Foundation — Eclipse Jetty (10.0.0)

## References

- [CNA](https://github.com/jetty/jetty.project/security/advisories/GHSA-85fq-fc5f-7j7g)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.29%
- **EPSS Percentile:** 21.7

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._