Description
IBM WebSphere Application Server - Liberty 17.0.0.3 through 26.0.0.7 is vulnerable to a denial of service, caused by sending a specially crafted request. A remote attacker could exploit this vulnerability to cause the server to consume memory resources.
Published: 2026-07-30
Score: 7.5 High
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

Impact

IBM WebSphere Application Server Liberty 17.0.0.3 through 26.0.0.7 suffers from a denial of service vulnerability that allows a remote attacker to send a specially crafted request that forces the server to consume excessive memory resources. The flaw is classified as a resource consumption weakness (CWE‑770).

Affected Systems

The affected operating environment is IBM WebSphere Application Server Liberty, versions 17.0.0.3 up to 26.0.0.7, which may include the servlet-3.1, servlet-4.0, servlet-5.0, servlet-6.0, or servlet-6.1 features.

Risk and Exploitability

The vulnerability scores a CVSS of 7.5, indicating a high severity. The EPSS score is < 1%, suggesting a very low exploitation probability. The issue is not listed in the CISA KEV catalog. The likely attack vector is remote, through a crafted HTTP/2 request sent over the network to the WebSphere Application Server Liberty instance. Successful exploitation would lead to memory exhaustion and service disruption for legitimate users.

Generated by OpenCVE AI on August 3, 2026 at 10:49 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 PH71839.  To determine if a feature is enabled for IBM 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 - 26.0.0.7 using the servlet-3.1, servlet-4.0, servlet-5.0, servlet-6.0, or 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 PH71839 https://www.ibm.com/support/pages/node/7277460 --OR-- · Apply Liberty Fix Pack 26.0.0.8 or later (targeted availability 3Q2026).  Additional interim fixes may be available and linked off the interim fix download page.

OpenCVE Recommended Actions

  • Apply the IBM interim fix that resolves APAR PH71839 (download from IBM support).
  • If the interim fix cannot be applied immediately, upgrade to Liberty Fix Pack 26.0.0.8 or later when it becomes available (targeted 3Q2026).
  • Verify whether the servlet-3.1, servlet-4.0, servlet-5.0, servlet-6.0, or servlet-6.1 features are enabled; if so, ensure minimal fix pack levels before applying the interim fix, following IBM guidance on feature deployment.

Generated by OpenCVE AI on August 3, 2026 at 10:49 UTC.

Tracking

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Advisories

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History

Thu, 30 Jul 2026 18:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

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

Thu, 30 Jul 2026 15:00:00 +0000

Type Values Removed Values Added
Description IBM WebSphere Application Server - Liberty 17.0.0.3 through 26.0.0.7 is vulnerable to a denial of service, caused by sending a specially crafted request. A remote attacker could exploit this vulnerability to cause the server to consume memory resources.
Title IBM WebSphere Application Server Liberty is affected by a denial of service vulnerability with HTTP/2
First Time appeared Ibm
Ibm websphere Application Server Liberty
Weaknesses CWE-770
CPEs cpe:2.3:a:ibm:websphere_application_server_liberty:17.0.0.3:*:*:*:*:*:*:*
cpe:2.3:a:ibm:websphere_application_server_liberty:26.0.0.7:*:*:*:*:*:*:*
Vendors & Products Ibm
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:H/I:N/A:N'}

Subscriptions

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

Status: PUBLISHED

Assigner: ibm

Published:

Updated: 2026-07-30T17:37:03.035Z

Reserved: 2026-06-10T15:40:44.241Z

Link: CVE-2026-11897

cve-icon Vulnrichment

Updated: 2026-07-30T17:30:17.710Z

cve-icon NVD

Status : Analyzed

Published: 2026-07-30T15:16:24.143

Modified: 2026-08-04T15:26:57.447

Link: CVE-2026-11897

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-08-03T11:00:03Z

Weaknesses
  • CWE-770

    Allocation of Resources Without Limits or Throttling