Description
IBM WebSphere Application Server - Liberty 17.0.0.3 through 26.0.0.10 and IBM WebSphere Application Server 8.5, and 9.0 Liberty could allow a remote unauthenticated attacker to cause a denial of service due to uncontrolled resource consumption.
Published: 2026-10-13
Score: 7.5 High
EPSS: n/a
KEV: No
Impact: Denial of Service
Action: Apply Patch
AI Analysis

Impact

The vulnerability allows a remote, unauthenticated attacker to trigger a denial of service by exploiting uncontrolled resource consumption. Because the flaw exists in the servlet handling of public modules, the attacker can send crafted requests that cause the server to exhaust CPU or memory, leading to unavailability. The description explicitly names remote unauthenticated control and uncontrolled resources. The likely attack vector is through network traffic directed at the WebSphere Application Server's HTTP interface; this is inferred from the remote nature of the threat.

Affected Systems

IBM WebSphere Application Server Liberty versions 17.0.0.3 through 26.0.0.10 are affected. The traditional WebSphere Application Server 8.5.x (8.5.0.0 to 8.5.5.31) and 9.0.x (9.0.0.0 to 9.0.5.29) are also impacted. These versions support servlet specifications 3.0 to 6.1. The vendor is IBM.

Risk and Exploitability

The CVSS score of 7.5 indicates substantial impact. EPSS is not available, but the lack of a KEV listing suggests no confirmed exploits yet. Attackers can bypass authentication and repeatedly send requests that consume resources, causing denial. IBM recommends applying the interim fix (DT502944 for Liberty, DT502943 for traditional) or upgrading to the indicated fix packs once available.

Generated by OpenCVE AI on October 13, 2026 at 17:10 UTC.

Remediation

Vendor Solution

IBM strongly recommends addressing the vulnerability now by applying a currently available interim fix or fix pack that contains the fix for APAR DT502944 and DT502943. To determine if a feature is enabled for WebSphere Application Server Liberty, refer to  How to determine if Liberty is using a specific feature https://www.ibm.com/support/pages/node/6553910 .  For IBM WebSphere Application Server Liberty 17.0.0.3 - 26.0.0.10 using the servlet-3.0, servlet-3.1, servlet-4.0, servlet-5.0, servlet-6.0, servlet-6.1 feature(s): · Upgrade to minimal fix pack levels as required by the interim fix and then apply the Interim Fix that resolves DT502944 https://www.ibm.com/support/pages/node/7292209 https://www.ibm.com/support/pages/node/7292209 --OR-- · Apply Fix Pack 26.0.0.11 or later (targeted availability 4Q2026). For IBM WebSphere Application Server traditional: For V9.0.0.0 through 9.0.5.29: · Upgrade to minimal fix pack levels as required by the interim fix and then apply the Interim Fix that resolves DT502943 https://www.ibm.com/support/pages/node/7292210 --OR-- · Apply Fix Pack 9.0.5.30 or later (targeted availability 4Q2026).   For V8.5.0.0 through 8.5.5.31: · Upgrade to minimal fix pack levels as required by interim fix and then apply Interim Fix that resolves DT502943 https://www.ibm.com/support/pages/node/7292210 https://www.ibm.com/support/pages/node/7292210 --OR-- · Apply Fix Pack 8.5.5.32 or later (targeted availability 4Q2026). Additional interim fixes may be available and linked off the interim fix download page.

OpenCVE Recommended Actions

  • Apply the interim fix DT502944 for Liberty or DT502943 for traditional, following IBM's guidance on minimal fix pack prerequisites.
  • Alternatively, upgrade to the latest fix pack (Liberty 26.0.0.11+, Traditional 9.0.5.30+ or 8.5.5.32+) to secure the fix.
  • Verify that any servlet features from 3.0 to 6.1 are enabled only if required; disable unneeded features to reduce attack surface per IBM's best‑practice guide.

Generated by OpenCVE AI on October 13, 2026 at 17:10 UTC.

Tracking

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Advisories

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History

Tue, 13 Oct 2026 15:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Tue, 13 Oct 2026 14:00:00 +0000

Type Values Removed Values Added
Description IBM WebSphere Application Server - Liberty 17.0.0.3 through 26.0.0.10 and IBM WebSphere Application Server 8.5, and 9.0 Liberty could allow a remote unauthenticated attacker to cause a denial of service due to uncontrolled resource consumption.
Title IBM WebSphere Application Server and WebSphere Application Server Liberty are affected by a denial of service
First Time appeared Ibm
Ibm websphere Application Server
Ibm websphere Application Server Liberty
Weaknesses CWE-400
CPEs cpe:2.3:a:ibm:websphere_application_server:8.5.0:*:*:*:*:*:*:*
cpe:2.3:a:ibm:websphere_application_server:8.5:*:*:*:*:*:*:*
cpe:2.3:a:ibm:websphere_application_server:9.0.0:*:*:*:*:*:*:*
cpe:2.3:a:ibm:websphere_application_server:9.0:*:*:*:*:*:*:*
cpe:2.3:a:ibm:websphere_application_server_liberty:17.0.0.3:*:*:*:*:*:*:*
cpe:2.3:a:ibm:websphere_application_server_liberty:26.0.0.10:*:*:*:*:*:*:*
Vendors & Products Ibm
Ibm websphere Application Server
Ibm websphere Application Server Liberty
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}

Subscriptions

Ibm Websphere Application Server Websphere Application Server Liberty
cve-icon MITRE

Status: PUBLISHED

Assigner: ibm

Published:

Updated: 2026-10-13T14:28:58.466Z

Reserved: 2026-09-30T17:11:05.181Z

Link: CVE-2026-103499

cve-icon Vulnrichment

Updated: 2026-10-13T14:28:47.053Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-10-13T14:17:18.873

Modified: 2026-10-13T16:17:14.080

Link: CVE-2026-103499

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-13T17:15:15Z

Weaknesses
  • CWE-400

    Uncontrolled Resource Consumption