IBM WebSphere App Server 9.0/8.5/Liberty 17-26 HTTP Request Smuggling
CVE-2026-8646 Published on June 22, 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 26.0.0.6 are vulnerable to HTTP request smuggling. A remote attacker could smuggle a specially crafted request to the application server thereby allowing the attacker to bypass security controls, spoof identity, escalate privilege, and expose sensitive information.
Vulnerability Analysis
CVE-2026-8646 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-2026-8646 has been classified to as a HTTP Request Smuggling vulnerability or weakness.
Products Associated with CVE-2026-8646
stack.watch emails you whenever new vulnerabilities are published in IBM WebSphere Application Server or IBM Websphere Application Server Liberty. Just hit a watch button to start following.
Affected Versions
IBM WebSphere Application Server:- Version 9.0.0, <= 7.0.2 Interim Fix 035 is affected.
- Version 8.5.0, <= 7.0.3 Interim Fix 017 is affected.
- Version 17.0.0.3, <= 26.0.0.6 is affected.