What’s Vulnerable › Vulnerabilities
CVE-2026-19204
- Severity: high (CVSS 8.7 v4.0)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.5% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-09-07 · updated 2026-09-08
- Weakness: CWE-770
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
- The Eclipse Foundation Eclipse Jetty: from 12.1.0 through 12.1.11; from 12.0.0 through 12.0.37; from 11.0.0 through 11.0.31; from 10.0.0 through 10.0.31
References
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