IBM HTTP Server 8.5, and 9.0 is vulnerable to remote code execution and denial of service in configurations with TLS mutual authentication (client authentication).
"}],"value":"IBM HTTP Server 8.5, and 9.0 is vulnerable to remote code execution and denial of service in configurations with TLS mutual authentication (client authentication)."}],"metrics":[{"cvssV3_1":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":8.1,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}]}],"problemTypes":[{"descriptions":[{"cweId":"CWE-94","description":"CWE-94 Improper Control of Generation of Code ('Code Injection')","lang":"en","type":"CWE"}]}],"providerMetadata":{"dateUpdated":"2026-05-26T16:58:54.958Z","orgId":"9a959283-ebb5-44b6-b705-dcc2bbced522","shortName":"ibm"},"references":[{"tags":["vendor-advisory","patch"],"url":"https://www.ibm.com/support/pages/node/7274065"}],"solutions":[{"lang":"en","supportingMedia":[{"base64":false,"type":"text/html","value":"IBM strongly recommends addressing the vulnerability now by applying a currently available interim fix or fix pack that contains the fix for APAR PH71265.
For IBM HTTP Server used by IBM WebSphere Application Server:
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 PH71265
--OR--
· Apply Fix Pack 9.0.5.29 or later (targeted availability 3Q2026).
For V8.5.0.0 through 8.5.5.29:
· Upgrade to minimal fix pack levels as required by the interim fix and then apply the Interim Fix that resolves PH71265
--OR--
· Apply Fix Pack 8.5.5.30 or later (targeted availability 3Q2026).
Additional interim fixes may be available and linked off the interim fix download page.
Important Note
IBM strongly suggests that all System z customers be subscribed to the System z Security Portal to receive the latest critical System z security and integrity service. If you are not subscribed, see the instructions on the System z Security web site. Security and integrity APARs and associated fixes will be posted to this portal. IBM suggests reviewing the CVSS scores and applying all security or integrity fixes as soon as possible to minimize any potential risk.
"}],"value":"IBM strongly recommends addressing the vulnerability now by applying a currently available interim fix or fix pack that contains the fix for APAR PH71265.For IBM HTTP Server used by IBM WebSphere Application Server: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 PH71265--OR--· Apply Fix Pack 9.0.5.29 or later (targeted availability 3Q2026). For V8.5.0.0 through 8.5.5.29:· Upgrade to minimal fix pack levels as required by the interim fix and then apply the Interim Fix that resolves PH71265--OR--· Apply Fix Pack 8.5.5.30 or later (targeted availability 3Q2026). Additional interim fixes may be available and linked off the interim fix download page.Important NoteIBM strongly suggests that all System z customers be subscribed to the System z Security Portal to receive the latest critical System z security and integrity service. If you are not subscribed, see the instructions on the System z Security web site. Security and integrity APARs and associated fixes will be posted to this portal. IBM suggests reviewing the CVSS scores and applying all security or integrity fixes as soon as possible to minimize any potential risk."}],"title":"IBM HTTP Server is affected by multiple vulnerabilities","x_generator":{"engine":"ibm-cvegen"}}},"cveMetadata":{"assignerOrgId":"9a959283-ebb5-44b6-b705-dcc2bbced522","assignerShortName":"ibm","cveId":"CVE-2026-8855","datePublished":"2026-05-26T16:58:54.958Z","dateReserved":"2026-05-18T16:27:17.633Z","dateUpdated":"2026-05-26T16:58:54.958Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-05-26 18:16:57","lastModifiedDate":"2026-05-26 20:25:33","problem_types":["CWE-94","CWE-94 CWE-94 Improper Control of Generation of Code ('Code Injection')"],"metrics":{"cvssMetricV31":[{"source":"psirt@us.ibm.com","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","baseScore":8.1,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"HIGH","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":2.2,"impactScore":5.9},{"source":"nvd@nist.gov","type":"Primary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","baseScore":9.8,"baseSeverity":"CRITICAL","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":3.9,"impactScore":5.9}]},"configurations":[{"operator":"AND","nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:ibm:http_server:*:*:*:*:*:*:*:*","versionStartIncluding":"8.5.0.0","versionEndExcluding":"8.5.5.30","matchCriteriaId":"D02EA5D6-7556-4C20-A991-6DC5F6B7351B"},{"vulnerable":true,"criteria":"cpe:2.3:a:ibm:http_server:*:*:*:*:*:*:*:*","versionStartIncluding":"9.0.0.0","versionEndExcluding":"9.0.5.29","matchCriteriaId":"F7790D7F-B70F-4278-877B-DE501C60A9B5"}]},{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":false,"criteria":"cpe:2.3:o:ibm:aix:-:*:*:*:*:*:*:*","matchCriteriaId":"E492C463-D76E-49B7-A4D4-3B499E422D89"},{"vulnerable":false,"criteria":"cpe:2.3:o:ibm:z\\/os:-:*:*:*:*:*:*:*","matchCriteriaId":"0E97A964-6F9E-4C87-9B90-21AE2C1DF52F"},{"vulnerable":false,"criteria":"cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*","matchCriteriaId":"703AF700-7A70-47E2-BC3A-7FD03B3CA9C1"},{"vulnerable":false,"criteria":"cpe:2.3:o:microsoft:windows:-:*:*:*:*:*:*:*","matchCriteriaId":"A2572D17-1DE6-457B-99CC-64AFD54487EA"}]}]}]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"8855","Ordinal":"1","Title":"IBM HTTP Server is affected by multiple vulnerabilities","CVE":"CVE-2026-8855","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"8855","Ordinal":"1","NoteData":"IBM HTTP Server 8.5, and 9.0 is vulnerable to remote code execution and denial of service in configurations with TLS mutual authentication (client authentication).","Type":"Description","Title":"IBM HTTP Server is affected by multiple vulnerabilities"}]}}}