CVE-2026-11897

IBM WebSphere Application Server Liberty is affected by a denial of service vulnerability with HTTP/2

Published Jul 30, 2026 CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed
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.

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.

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

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

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'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
ibm
Published
Updated
Jul 30, 2026, 5:37 PM
Reserved
Jun 10, 2026, 3:40 PM
Status
Analyzed
Published
Jul 30, 2026, 3:16 PM
Modified
Oct 23, 2026, 10:10 PM