CVE-2026-9338Network attack vector

Unauthenticated service degradation via resource exhaustion

Published Sep 10, 2026 · Updated Sep 10, 2026

Resource exhaustion in IBM WebSphere Application Server 8.5 and 9.0 allows remote attackers to degrade service via a crafted request. IBM states that the request triggers excessive resource consumption but has not disclosed the affected endpoint, parser, resource, or faulty operation. No authentication or user interaction is required; the documented consequence is reduced service availability rather than a confirmed crash or shutdown.

CVSS severity5.3
Medium
EPSS probability0.29%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource exhaustion in IBM WebSphere Application Server 8.5 and 9.0 allows remote attackers to degrade service via a crafted request. IBM states that the request triggers excessive resource consumption but has not disclosed the affected endpoint, parser, resource, or faulty operation. No authentication or user interaction is required; the documented consequence is reduced service availability rather than a confirmed crash or shutdown.

The record

CVE
CVE-2026-9338
Published
Sep 10, 2026
Updated
Sep 10, 2026
Vendor
IBM
Product
IBM WebSphere Application Server
Classifications
CWE-400, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 10, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 10, 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=8.5
  2. Affected versionversion=9.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

IBM · IBM WebSphere Application Serverversion=8.5; version=9.0

Published CVSS scores

5.3IBMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
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.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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