{"id":"CVE-2026-11548","state":"PUBLISHED","title":"IBM WebSphere Application Server and IBM WebSphere Application Server - Liberty HTTP Request Smuggling","description":"IBM WebSphere Application Server 8.5 and 9.0, and and IBM WebSphere Application Server - Liberty 17.0.0.3 through 26.0.0.8 are affected by an HTTP request smuggling vulnerability.","publishedAt":"2026-09-18T19:05:48.682Z","updatedAt":"2026-10-22T18:53:43.218Z","severity":{"score":4.8,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N","source":"ibm"},"assigner":"ibm","products":["IBM WebSphere Application Server","IBM WebSphere Application Server - Liberty"],"affected":[{"vendor":"IBM","product":"WebSphere Application Server","versions":[{"version":"9.0","status":"affected"},{"version":"8.5","status":"affected"}],"cpes":["cpe:2.3:a:ibm:websphere_application_server:9.0:*:*:*:*:*:*:*","cpe:2.3:a:ibm:websphere_application_server:9.0.0:*:*:*:*:*:*:*","cpe:2.3:a:ibm:websphere_application_server:8.5:*:*:*:*:*:*:*","cpe:2.3:a:ibm:websphere_application_server:8.5.0:*:*:*:*:*:*:*"]},{"vendor":"IBM","product":"WebSphere Application Server - Liberty","versions":[{"version":"17.0.0.3","status":"affected","lessThanOrEqual":"26.0.0.5","versionType":"semver"}],"cpes":["cpe:2.3:a:ibm:websphere_application_server_liberty:17.0.0.3:*:*:*:*:*:*:*","cpe:2.3:a:ibm:websphere_application_server_liberty:26.0.0.8:*:*:*:*:*:*:*"]}],"references":["https://www.ibm.com/support/pages/node/7286610","https://www.ibm.com/support/pages/node/7286611"],"weaknesses":["CWE-444"],"ingestedAt":"2026-10-29T20:10:52.580Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/11xxx/CVE-2026-11548.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-11548","state":"PUBLISHED","datePublished":"2026-09-18T19:05:48.682Z","dateUpdated":"2026-10-22T18:53:43.218Z","assignerShortName":"ibm","assignerOrgId":"9a959283-ebb5-44b6-b705-dcc2bbced522","dateReserved":"2026-06-08T03:23:44.255Z"},"containers":{"cna":{"title":"IBM WebSphere Application Server and IBM WebSphere Application Server - Liberty HTTP Request Smuggling","descriptions":[{"lang":"en","value":"IBM WebSphere Application Server 8.5 and 9.0, and and IBM WebSphere Application Server - Liberty 17.0.0.3 through 26.0.0.8 are affected by an HTTP request smuggling vulnerability."}],"affected":[{"vendor":"IBM","product":"WebSphere Application Server","versions":[{"version":"9.0","status":"affected"},{"version":"8.5","status":"affected"}],"cpes":["cpe:2.3:a:ibm:websphere_application_server:9.0:*:*:*:*:*:*:*","cpe:2.3:a:ibm:websphere_application_server:9.0.0:*:*:*:*:*:*:*","cpe:2.3:a:ibm:websphere_application_server:8.5:*:*:*:*:*:*:*","cpe:2.3:a:ibm:websphere_application_server:8.5.0:*:*:*:*:*:*:*"]},{"vendor":"IBM","product":"WebSphere Application Server - Liberty","versions":[{"version":"17.0.0.3","status":"affected","lessThanOrEqual":"26.0.0.5","versionType":"semver"}],"cpes":["cpe:2.3:a:ibm:websphere_application_server_liberty:17.0.0.3:*:*:*:*:*:*:*","cpe:2.3:a:ibm:websphere_application_server_liberty:26.0.0.8:*:*:*:*:*:*:*"]}],"references":[{"url":"https://www.ibm.com/support/pages/node/7286610","tags":["vendor-advisory","patch"]},{"url":"https://www.ibm.com/support/pages/node/7286611","tags":["vendor-advisory","patch"]}],"metrics":[{"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}],"cvssV3_1":{"version":"3.1","attackVector":"NETWORK","attackComplexity":"HIGH","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"LOW","integrityImpact":"LOW","availabilityImpact":"NONE","baseSeverity":"MEDIUM","baseScore":4.8,"vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-444","lang":"en","description":"CWE-444 Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')","type":"CWE"}]}],"providerMetadata":{"shortName":"ibm","orgId":"9a959283-ebb5-44b6-b705-dcc2bbced522","dateUpdated":"2026-10-22T18:53:43.218Z"},"solutions":[{"lang":"en","value":"IBM strongly recommends addressing the vulnerabilities now by applying the fix pack(s) listed below.\n\n\n\nFor IBM WebSphere Application Server traditional:\n\n\n\nFor V9.0.0.0 through 9.0.5.28:\n· Apply Fix Pack 9.0.5.29 https://www.ibm.com/support/pages/node/7285876 (availability September 2026) or later fix pack. \n\n\n\nFor V8.5.0.0 through 8.5.5.30:\n· Apply Fix Pack 8.5.5.31 https://www.ibm.com/support/pages/node/7285869 (availability September 2026) or later fix pack. \n\n\n\n\n\n\n\n\nFor IBM WebSphere Application Server Liberty 17.0.0.3 - 26.0.0.8:\n· Apply Liberty Fix Pack 26.0.0.9 https://www.ibm.com/support/pages/node/7285875 (availability September 2026) or later fix pack.","supportingMedia":[{"type":"text/html","base64":false,"value":"

IBM strongly recommends addressing the vulnerabilities now by applying the fix pack(s) listed below.

For IBM WebSphere Application Server traditional:

For V9.0.0.0 through 9.0.5.28:
· Apply Fix Pack 9.0.5.29 (availability September 2026) or later fix pack. 

For V8.5.0.0 through 8.5.5.30:
· Apply Fix Pack 8.5.5.31 (availability September 2026) or later fix pack. 


For IBM WebSphere Application Server Liberty 17.0.0.3 - 26.0.0.8:
· Apply Liberty Fix Pack 26.0.0.9 (availability September 2026) or later fix pack. 

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