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 and IBM WebSphere Application Server - Liberty 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.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.