IBM WS HTTP Resp Smuggling via HTTP version token (pre 9.0/8.5, Liberty 17+)
CVE-2026-15064 Published on July 28, 2026
IBM WebSphere Application Server and WebSphere Application Server Liberty are affected by multiple vulnerabilities
IBM WebSphere Application Server 9.0, and 8.5 and IBM WebSphere Application Server - Liberty 17.0.0.3 through 26.0.0.7 is vulnerable to HTTP Response Smuggling due to improper handling of non-standard HTTP version tokens.
Vulnerability Analysis
CVE-2026-15064 is exploitable with network access, and does not require authorization privileges or user interaction. This vulnerability is consided to have a high level of attack complexity. The potential impact of an exploit of this vulnerability is considered to have a high impact on confidentiality and integrity, and no impact on availability.
Weakness Type
What is a HTTP Request Smuggling Vulnerability?
When malformed or abnormal HTTP requests are interpreted by one or more entities in the data flow between the user and the web server, such as a proxy or firewall, they can be interpreted inconsistently, allowing the attacker to "smuggle" a request to one device without the other device being aware of it.
CVE-2026-15064 has been classified to as a HTTP Request Smuggling vulnerability or weakness.
Products Associated with CVE-2026-15064
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Affected Versions
IBM WebSphere Application Server:- Version 9.0 is affected.
- Version 8.5 is affected.
- Version 17.0.0.3, <= 26.0.0.7 is affected.