Inconsistent interpretation of HTTP requests in IBM WebSphere Application Server and IBM WebSphere Application Server Liberty - CVE-2026-8646

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Main Vulnerability Database Vulnerabilities #VU139055

Inconsistent interpretation of HTTP requests in IBM WebSphere Application Server and IBM WebSphere Application Server Liberty - CVE-2026-8646

Published: July 22, 2026


Vulnerability identifier: #VU139055
CSH Severity: High
CVSS v4.0: CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Amber
CVE-ID: CVE-2026-8646
CWE-ID: CWE-444
Exploitation vector: Remote access
Exploit availability: No public exploit available
Vendor: IBM Corporation
Affected software:
IBM WebSphere Application Server
IBM WebSphere Application Server Liberty

Detailed vulnerability description

The vulnerability allows a remote attacker to perform HTTP request smuggling attacks.

The vulnerability exists due to improper validation of HTTP requests. A remote attacker can send a specially crafted HTTP request to the server and smuggle arbitrary HTTP headers.

Successful exploitation of vulnerability may allow an attacker to poison HTTP cache and perform phishing attacks.


How to mitigate CVE-2026-8646

Install updates from vendor's website.

Sources