jetty12: A client may send a WebSocket frame with an unknown opcode and a very large declared payload length, causing Jetty to...
CVE-2026-19204 is fixed in jetty12 on 1 platform by DEBIAN-CVE-2026-19204 (version 12.0.39-1), released September 7, 2026. It is not reported as exploited. Patch Radar priority: Routine.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| jetty12 · Debian 14 | 12.0.39-1 | DEBIAN-CVE-2026-19204 | Sep 7, 2026 |
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