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CVE-2026-19204

HIGH
8.7
CVSS Score
Published: September 7, 2026 at 10:19 AM UTC
Updated: September 8, 2026 at 04:18 PM UTC
1 product affected across 1 vendorJetty

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Severity
HIGH8.7
Exploit prediction
EPSS 0.5%
SSVC
No known exploit

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Jetty· Eclipsemaven
60%
10.0.0 ≤ v ≤ 10.0.3111.0.0 ≤ v ≤ 11.0.3112.0.0 ≤ v ≤ 12.0.3712.1.0 ≤ v ≤ 12.1.1110.0.011.0.012.0.012.1.0

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (1)

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

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8.7HIGHeclipse
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-770CWE-789

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