IBM WebSphere Application Server 9.0, and 8.5 and IBM WebSphere Application Server - Liberty 17.0.0.3 through 26.0.0.6 are affected by an HTTP request smuggling vulnerability.
IBM strongly recommends addressing the vulnerability now by applying a currently available interim fix or fix pack that contains the fix for APAR PH71808 and PH71706.
For IBM WebSphere Application Server Liberty 17.0.0.3 - 26.0.0.6:
· Upgrade to minimal fix pack levels as required by the interim fix and then apply the Interim Fix that resolves PH71808 https://www.ibm.com/support/pages/node/7277460
--OR--
· Apply Fix Pack 26.0.0.7 or later (targeted availability 3Q2026).
For IBM WebSphere Application Server traditional:
For V9.0.0.0 through 9.0.5.28:
· Upgrade to minimal fix pack levels as required by the interim fix and then apply the Interim Fix that resolves PH71706 https://www.ibm.com/support/pages/node/7277463
--OR--
· Apply Fix Pack 9.0.5.29 or later (targeted availability 3Q2026).
For V8.5.0.0 through 8.5.5.30:
· Upgrade to minimal fix pack levels as required by the interim fix and then apply the Interim Fix that resolves PH71706 https://www.ibm.com/support/pages/node/7277463
--OR--
· Apply Fix Pack 8.5.5.31 or later (targeted availability 3Q2026).
Additional interim fixes may be available and linked off the interim fix download page.