EUVD-2026-72335
GHSA-w753-5ffq-99wr
Severity by source
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Network-reachable WebSocket, no auth or interaction required, purely availability impact; scope unchanged as crash is contained to the JVM process.
Primary rating from Vendor (eclipse).
CVSS VectorVendor: eclipse
Lifecycle Timeline
2DescriptionCVE.org
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.
AnalysisAI
Unauthenticated remote denial-of-service in Eclipse Jetty's WebSocket implementation allows any network-accessible client to exhaust the JVM heap by sending a single WebSocket frame with an unknown opcode and an arbitrarily large declared payload length. When auto-fragmentation is enabled, unknown opcodes bypass the normal maximum frame size check, causing Jetty to attempt heap allocation for the declared payload size before the opcode is ever validated - a logic-ordering flaw classified under CWE-770. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Auto-fragmentation must be enabled in the Jetty WebSocket configuration - this is the specific deployment setting that introduces the vulnerable code path. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:N/UI:N/VA:H) is internally consistent with the described attack: no authentication, no special timing, a single WebSocket frame, and complete service unavailability as the outcome. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Upgrade Eclipse Jetty to the patched version specified in security advisory GHSA-85fq-fc5f-7j7g at https://github.com/jetty/jetty.project/security/advisories/GHSA-85fq-fc5f-7j7g - the exact fixed release version is not confirmed in the available data and must be retrieved from that advisory. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: identify and document all production and non-production systems running Eclipse Jetty with WebSocket enabled, including version numbers and criticality classifications. …
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External POC / Exploit Code
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