CVE-2026-19204

State: Published
Severity: 8.7 High
Published: Sep 7, 2026
Updated: Sep 8, 2026
Reserved: Aug 7, 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.

Scores

CVSS	Score	Vector	Source
4.0	8.7 High	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	eclipse

Weaknesses

CWE-770 Allocation of resources without limits or throttling
CWE-789 Memory allocation with excessive size value

Affected Products

Product	Versions
Eclipse JettyEclipse Foundation	12.1.0 through 12.1.11Affected 12.0.0 through 12.0.37Affected 11.0.0 through 11.0.31Affected 10.0.0 through 10.0.31Affected

References

https://github.com/jetty/jetty.project/security/advisories/GHSA-85fq-fc5f-7j7g

Every record here comes from the CVE Program’s CVE List. © 1999–2026 The MITRE Corporation. CVE is a registered trademark of The MITRE Corporation. The records are reproduced under the CVE Program terms of use.