6.5Medium
CVE-2026-15634IBM WebSphere Application Server and IBM WebSphere Application Server - Liberty Request Smuggling
Description
IBM WebSphere Application Server 8.5 and 9.0, and IBM WebSphere Application Server - Liberty 17.0.0.3 through 26.0.0.8 are vulnerable to HTTP request smuggling, caused by improper parsing of the HTTP transfer-encoding request header. By sending a specially crafted HTTP transfer-encoding request header, an attacker could exploit this vulnerability to poison the web cache, bypass web application firewall protection, and conduct XSS attacks.
Weakness (CWE):
CWE-444
Data: CVE.org, NVD, CISA KEV, FIRST EPSS, Ubuntu. Published as the sources state it, in English.
Affected products and versions
| Vendor | Product | Versions | |
|---|---|---|---|
| IBM | WebSphere Application Server | 9.0, 8.5 | |
| IBM | WebSphere Application Server - Liberty | 17.0.0.3 – ≤ 26.0.0.5 |
References and patches
- https://www.ibm.com/support/pages/node/7286610 vendor-advisorypatch
- https://www.ibm.com/support/pages/node/7286611 vendor-advisorypatch