CVE-2026-8646: IBM WebSphere Application Server and WebSphere Application Server Liberty are affected by multiple vulnerabilities

Published Jun 16, 2026
·
Updated

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.

Other sources

IBM WebSphere Application Server and WebSphere Application Server Liberty 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.

— IBM

Affected Software

11 affected components
All of the following
Any of the following
IBM WebSphere Application Server>=8.5.0.0<8.5.5.30
IBM WebSphere Application Server>=9.0.0.0<9.0.5.29
IBM WebSphere Application Server>=17.0.0.3<26.0.0.7
Any of the following
Apple macOS
IBM AIX
IBM i
IBM Z\/os
Linux Linux kernel
Microsoft Windows
IBM PowerVM Novalink<=2.2.02.2.12.2.1.1
IBM PowerVM Novalink<=2.3.02.3.0.12.3.12.3.2

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade IBM WebSphere Application Server Liberty to a version that resolves this vulnerability.

    Fixed in 26.0.0.7
  2. Upgrade

    Upgrade IBM WebSphere Application Server to a version that resolves this vulnerability.

    Fixed in 8.5.5.30
  3. Upgrade

    Upgrade IBM WebSphere Application Server to a version that resolves this vulnerability.

    Fixed in 9.0.5.29
  4. Upgrade

    Upgrade IBM WebSphere Application Server to a version that resolves this vulnerability.

    Patch PH71370
  5. Upgrade

    Upgrade IBM WebSphere Application Server to a version that resolves this vulnerability.

    Patch PH71631

Event History

Jun 22, 2026
CVE Published
via MITRE·02:44 PM
Data Sourced
via MITRE·02:44 PM
RemedyDescriptionSeverityWeakness
Data Sourced
via NVD·04:16 PM
DescriptionSeverityWeaknessAffected Software
Jul 16, 2026
Data Sourced
via IBM·12:00 AM
DescriptionAffected Software

Parent advisories

This vulnerability appears in the following advisories.

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Frequently Asked Questions

1

What is the severity of CVE-2026-8646?

The severity of CVE-2026-8646 is rated as critical with a score of 9.1.

2

How do I fix CVE-2026-8646?

To fix CVE-2026-8646, upgrade to the latest version of IBM WebSphere Application Server or IBM WebSphere Application Server - Liberty as per the vendor's recommendations.

3

What type of vulnerability is CVE-2026-8646?

CVE-2026-8646 is an HTTP request smuggling vulnerability that allows a remote attacker to bypass security controls.

4

Which versions are affected by CVE-2026-8646?

CVE-2026-8646 affects IBM WebSphere Application Server versions 9.0 and 8.5, and IBM WebSphere Application Server - Liberty versions 17.0.0.3 through 26.0.0.6.

5

Can CVE-2026-8646 lead to data compromise?

Yes, CVE-2026-8646 has the potential to lead to data compromise due to its ability to allow attackers to manipulate requests.

Company

Resources

Contact

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