CVE-2026-9002

Adjacent JVM crash via malformed XDF messages

Published Jun 30, 2026 · Updated Jun 30, 2026

Uncontrolled resource consumption in IBM WebSphere eXtreme Scale 8.6.1.0 through 8.6.1.6 allows remote attackers to crash its JVM. The XDF decoder accepts deeply nested Protocol Buffers messages and attacker-controlled length prefixes without sufficient bounds checks, exhausting stack or heap memory. The attack requires network adjacency and an XIO data grid with XDF enabled through COPY_TO_BYTES; successful exploitation interrupts service from the affected WebSphere Application Server JVM.

CVSS severity6.5
Medium
EPSS probability0.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Uncontrolled resource consumption in IBM WebSphere eXtreme Scale 8.6.1.0 through 8.6.1.6 allows remote attackers to crash its JVM. The XDF decoder accepts deeply nested Protocol Buffers messages and attacker-controlled length prefixes without sufficient bounds checks, exhausting stack or heap memory. The attack requires network adjacency and an XIO data grid with XDF enabled through COPY_TO_BYTES; successful exploitation interrupts service from the affected WebSphere Application Server JVM.

The record

CVE
CVE-2026-9002
Published
Jun 30, 2026
Updated
Jun 30, 2026
Vendor
OpenBMC Project
Product
IBM WebSphere eXtreme Scale
Classifications
CWE-400, T1499.004
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 30, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 30, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=8.6.1.0 <=8.6.1.6

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

OpenBMC Project · IBM WebSphere eXtreme Scaleversion=8.6.1.0 <=8.6.1.6

Published CVSS scores

6.5IBMCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-400Uncontrolled Resource Consumption
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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