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.
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.