IBM WebSphere Application Server and WebSphere Application Server Liberty are affected by HTTP request smuggling
Summary
| CVE | CVE-2026-11541 |
|---|---|
| State | PUBLISHED |
| Assigner | ibm |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-06-30 22:16:46 UTC |
| Updated | 2026-07-02 17:55:28 UTC |
| Description | 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 affected by an HTTP request smuggling vulnerability. |
Risk And Classification
Primary CVSS: v3.1 9.8 CRITICAL from [email protected]
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS: 0.004180000 probability, percentile 0.335970000 (date 2026-07-04)
Problem Types: CWE-444 | CWE-444 CWE-444 Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 3.1 | [email protected] | Primary | 9.8 | CRITICAL | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| 3.1 | [email protected] | Secondary | 7.4 | HIGH | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N |
| 3.1 | CNA | CVSS | 7.4 | HIGH | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N |
CVSS v3.1 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD Known Affected Configurations (CPE 2.3)
| Type | Vendor | Product | Version | Update | Edition | Language |
|---|---|---|---|---|---|---|
| Application | Ibm | Websphere Application Server | All | All | All | All |
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | IBM | WebSphere Application Server | affected 9.0 | Not specified |
| CNA | IBM | WebSphere Application Server | affected 8.5 | Not specified |
| CNA | IBM | WebSphere Application Server - Liberty | affected 17.0.0.3 26.0.0.6 semver | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| www.ibm.com/support/pages/node/7277550 | [email protected] | www.ibm.com | Vendor Advisory |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
Additional Advisory Data
Solutions
CNA: IBM strongly recommends addressing the vulnerability now by applying a currently available interim fix or fix pack that contains the fix for APAR PH71808 and PH71706. For IBM WebSphere Application Server Liberty 17.0.0.3 - 26.0.0.6: · Upgrade to minimal fix pack levels as required by the interim fix and then apply the Interim Fix that resolves PH71808 https://www.ibm.com/support/pages/node/7277460 --OR-- · Apply Fix Pack 26.0.0.7 or later (targeted availability 3Q2026). For IBM WebSphere Application Server traditional: For V9.0.0.0 through 9.0.5.28: · Upgrade to minimal fix pack levels as required by the interim fix and then apply the Interim Fix that resolves PH71706 https://www.ibm.com/support/pages/node/7277463 --OR-- · Apply Fix Pack 9.0.5.29 or later (targeted availability 3Q2026). For V8.5.0.0 through 8.5.5.30: · Upgrade to minimal fix pack levels as required by the interim fix and then apply the Interim Fix that resolves PH71706 https://www.ibm.com/support/pages/node/7277463 --OR-- · Apply Fix Pack 8.5.5.31 or later (targeted availability 3Q2026). Additional interim fixes may be available and linked off the interim fix download page.