CVE-2026-8858 PUBLISHED

IBM i is Affected By Denial of Service, HTTP Request Smuggling, and Remote Code Execution Vulnerabilities in IBM WebSphere Application Server Liberty [, , , , ]

Assigner: ibm
Reserved: 18.05.2026 Published: 22.06.2026 Updated: 22.06.2026

IBM i 7.6, 7.5, 7.4, and 7.3, IBM WebSphere Application Server and IBM WebSphere Application Server Liberty are vulnerable to remote code execution and denial of service in the WebSphere Web Server Plug-in component. This vulnerability can be exploited when an attacker impersonates the application server and sends crafted responses to the plug-in.

Metrics

CVSS 3.1

CVSS Vector: CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS Score: 7.5

Attack Vector	Adjacent Network	Scope	Unchanged
Attack Complexity	High	Confidentiality Impact	High
Privileges Required	None	Integrity Impact	High
User Interaction	None	Availability Impact	High

CVSS 3.1

Product Status

Vendor	IBM
Product	i
Versions	affected from 7.6.0 to 1.8.4 (incl.) Version 7.5.0 is affected Version 7.4.0 is affected Version 7.3.0 is affected

Solutions

IBM strongly recommends addressing the vulnerabilities now.

IBM i Release5770-SS1 Option 3 PTF Number(s)PTF Download Link(s)7.6SJ10122 https://www.ibm.com/mysupport/s/fix-information?legacy=SJ10122 7.5SJ10121 https://www.ibm.com/mysupport/s/fix-information?legacy=SJ10121 7.4SJ10120 https://www.ibm.com/mysupport/s/fix-information?legacy=SJ10120 7.3SJ10119 https://www.ibm.com/mysupport/s/fix-information?legacy=SJ10119

IBM recommends users running unsupported versions of affected products upgrade to a supported and fixed version of affected products.

References

https://www.ibm.com/support/pages/node/7277344

Problem Types

CWE-94 Improper Control of Generation of Code ('Code Injection') CWE