Description
IBM WebSphere Application Server 8.5, and 9.0 and IBM WebSphere Application Server - Liberty 17.0.0.3 through 26.0.0.10 Liberty could allow a remote attacker to cause a denial of service caused by an insecure deserialization in the messaging service.
Published: 2026-10-13
Score: 7.5 High
EPSS: < 1% Very Low
KEV: No
Impact: Denial of Service via insecure deserialization
Action: Patch Immediately
AI Analysis

Impact

IBM WebSphere Application Server and its Liberty profile are vulnerable to insecure deserialization within the messaging service. The flaw allows a remote attacker to send crafted serialized data that causes the application server to crash or restart, resulting in a denial of service. This weakness is identified as CWE-502.

Affected Systems

IBM WebSphere Application Server versions 8.5.0.0 through 8.5.5.31 and 9.0.0.0 through 9.0.5.29, and the Liberty profile from 17.0.0.3 to 26.0.0.10 are affected. The vulnerability is present in the messaging components shipped with these releases.

Risk and Exploitability

The CVSS score of 7.5 indicates a high severity impact, but the EPSS value of less than 1% suggests a very low probability of exploitation at present. The issue is not listed in the CISA KEV catalog, which further indicates limited public exploitation activity. The likely attack vector is a remote attacker transmitting a malicious serialized payload to the messaging endpoint over the network; no user interaction or local privileges are required for the denial of service to occur.

Generated by OpenCVE AI on October 16, 2026 at 05:09 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 DT503516 or DT503624. 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: · Upgrade to minimal fix pack levels as required by the interim fix and then apply the Interim Fix that resolves DT503516 https://www.ibm.com/support/pages/node/7292199 --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 DT503624 https://www.ibm.com/support/pages/node/7292200 --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 DT503624 https://www.ibm.com/support/pages/node/7292200 --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

  • Download and apply the interim fix for DT503516 (Liberty) or DT503624 (traditional) as soon as possible.
  • If further than the interim fix, update to Fix Pack 26.0.0.11 or later for Liberty and to Fix Pack 9.0.5.30 or 8.5.5.32 or later for traditional, ensuring the minimum required fix pack levels are first applied.
  • Verify whether the Liberty feature set includes the messaging service; if it is unnecessary in your environment, disable the feature to reduce exposure.
  • As a temporary defensive measure, restrict inbound network traffic to the messaging service ports to trusted hosts only until the patch is applied.

Generated by OpenCVE AI on October 16, 2026 at 05:09 UTC.

Tracking

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Advisories

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History

Wed, 14 Oct 2026 21:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

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

Tue, 13 Oct 2026 20:30:00 +0000

Type Values Removed Values Added
Description IBM WebSphere Application Server 8.5, and 9.0 and IBM WebSphere Application Server - Liberty 17.0.0.3 through 26.0.0.10 Liberty could allow a remote attacker to cause a denial of service caused by an insecure deserialization in the messaging service.
Title IBM WebSphere Application Server and WebSphere Application Server Liberty are affected by a deserialization of untrusted data
First Time appeared Ibm
Ibm websphere Application Server
Ibm websphere Application Server Liberty
Weaknesses CWE-502
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: 2026-10-14T16:56:20.607Z

Reserved: 2026-10-05T13:18:39.699Z

Link: CVE-2026-105442

cve-icon Vulnrichment

Updated: 2026-10-14T16:55:29.135Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-10-13T21:17:26.913

Modified: 2026-10-14T17:18:15.073

Link: CVE-2026-105442

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-23T20:15:06Z

Weaknesses
  • CWE-502

    Deserialization of Untrusted Data