{"id":"CVE-2026-15634","state":"PUBLISHED","title":"IBM WebSphere Application Server and IBM WebSphere Application Server - Liberty Request Smuggling","description":"IBM WebSphere Application Server 8.5 and 9.0, and IBM WebSphere Application Server - Liberty 17.0.0.3 through 26.0.0.8 are vulnerable to HTTP request smuggling, caused by improper parsing of the HTTP transfer-encoding request header. By sending a specially crafted HTTP transfer-encoding request header, an attacker could exploit this vulnerability to poison the web cache, bypass web application firewall protection, and conduct XSS attacks.","publishedAt":"2026-09-14T20:01:35.736Z","updatedAt":"2026-10-22T18:53:54.472Z","severity":{"score":6.5,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/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","defaultStatus":"unaffected","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":"2026-10-29T20:11:00.674Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/15xxx/CVE-2026-15634.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-15634","state":"PUBLISHED","datePublished":"2026-09-14T20:01:35.736Z","dateUpdated":"2026-10-22T18:53:54.472Z","assignerShortName":"ibm","assignerOrgId":"9a959283-ebb5-44b6-b705-dcc2bbced522","dateReserved":"2026-07-13T18:05:13.164Z"},"containers":{"cna":{"title":"IBM WebSphere Application Server and IBM WebSphere Application Server - Liberty Request Smuggling","descriptions":[{"lang":"en","value":"IBM WebSphere Application Server 8.5 and 9.0, and IBM WebSphere Application Server - Liberty 17.0.0.3 through 26.0.0.8 are vulnerable to HTTP request smuggling, caused by improper parsing of the HTTP transfer-encoding request header. By sending a specially crafted HTTP transfer-encoding request header, an attacker could exploit this vulnerability to poison the web cache, bypass web application firewall protection, and conduct XSS attacks."}],"affected":[{"vendor":"IBM","product":"WebSphere Application Server","defaultStatus":"unaffected","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":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"LOW","integrityImpact":"LOW","availabilityImpact":"NONE","baseSeverity":"MEDIUM","baseScore":6.5,"vectorString":"CVSS:3.1/AV:N/AC:L/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":"2026-10-22T18:53:54.472Z"},"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 SB0030823  (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":"<p>IBM strongly recommends addressing the vulnerabilities now by applying the fix pack(s) listed below.</p><p><strong>For IBM WebSphere Application Server traditional:</strong></p><p><strong>For V9.0.0.0 through 9.0.5.28:</strong><br>· Apply Fix Pack <a href=\"SB0030823\" rel=\"nofollow\">9.0.5.29</a> (availability September 2026) or later fix pack.&nbsp;</p><p><strong>For V8.5.0.0 through 8.5.5.30:</strong><br>· Apply Fix Pack <a href=\"https://www.ibm.com/support/pages/node/7285869\" rel=\"nofollow\">8.5.5.31</a> (availability September 2026) or later fix pack.&nbsp;</p><p><br></p><p><strong>For IBM WebSphere Application Server Liberty 17.0.0.3 - 26.0.0.8:</strong><br>· Apply Liberty Fix Pack <a href=\"https://www.ibm.com/support/pages/node/7285875\" rel=\"nofollow\">26.0.0.9</a> (availability September 2026) or later fix pack.&nbsp;</p>"}]}],"source":{"discovery":"UNKNOWN"},"x_generator":{"engine":"Vulnogram 1.0.5"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2026-15634","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"version":"2.0.3","timestamp":"2026-09-15T17:21:51.397909Z"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-09-15T17:31:48.776Z"}}]}}}