{"api_version":"1","generated_at":"2026-11-06T16:34:49+00:00","cve":"CVE-2026-12538","urls":{"html":"https://cve.report/CVE-2026-12538","api":"https://cve.report/api/cve/CVE-2026-12538.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-12538","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-12538"},"summary":{"title":"IBM MQ Appliance is affected by an improper validation vulnerability","description":"IBM MQ 9.4.0.0 to 9.4.0.26, 9.4.1.0 to 9.4.5.3, and 10.0.0.1 to 10.0.0.5 could allow an authenticated attacker to obtain sensitive information or cause a denial of service due to improper validation of message header structure length fields.","state":"PUBLISHED","assigner":"ibm","published_at":"2026-11-04 21:18:11","updated_at":"2026-11-04 21:18:11"},"problem_types":["CWE-124","CWE-124 CWE-124 Buffer Underwrite ('Buffer Underflow')"],"metrics":[{"version":"3.1","source":"psirt@us.ibm.com","type":"Primary","score":"5.4","severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:L","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:L","baseScore":5.4,"baseSeverity":"MEDIUM","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"LOW","integrityImpact":"NONE","availabilityImpact":"LOW"}},{"version":"3.1","source":"CNA","type":"CVSS","score":"5.4","severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:L","data":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"LOW","baseScore":5.4,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"NONE","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:L","version":"3.1"}}],"references":[{"url":"https://www.ibm.com/support/pages/node/7293035","name":"https://www.ibm.com/support/pages/node/7293035","refsource":"psirt@us.ibm.com","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-12538","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-12538","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"IBM","product":"MQ Appliance","version":"affected 9.4.0.0 9.4.0.26 semver","platforms":[]},{"source":"CNA","vendor":"IBM","product":"MQ Appliance","version":"affected 9.4.1.0 9.4.5.3 semver","platforms":[]},{"source":"CNA","vendor":"IBM","product":"MQ Appliance","version":"affected 10.0.0.1 10.0.0.5 semver","platforms":[]}],"timeline":[],"solutions":[{"source":"CNA","title":"","value":"This vulnerability is addressed under APAR DT500605.\n\n\n\nIBM strongly recommends addressing the vulnerability now.\n\n\n\nIBM MQ Appliance version 9.4 LTS\nApply  IBM MQ Appliance fix pack 9.4.0.30 https://www.ibm.com/support/fixcentral/swg/selectFixes , or later firmware.\n\n\n\nIBM MQ Appliance version 9.4 CD - M2003\nUpgrade to  IBM MQ Appliance 10.0.0.6 https://www.ibm.com/support/fixcentral/swg/selectFixes , or later firmware.\n\n\n\nIBM MQ Appliance version 9.4 CD - M2002\nApply  IBM MQ Appliance cumulative security update 9.4.5.4 https://www.ibm.com/support/fixcentral/swg/selectFixes , or later firmware.\n\n\n\nIBM MQ Appliance version 10 LTS\nApply  IBM MQ Appliance cumulative security update 10.0.0.6 https://www.ibm.com/support/fixcentral/swg/selectFixes , or later firmware.","time":"","lang":"en"}],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"cpes":["cpe:2.3:a:ibm:mq_appliance:9.4:*:*:*:*:*:*:*","cpe:2.3:a:ibm:mq_appliance:9.4.0:*:*:*:*:*:*:*","cpe:2.3:a:ibm:mq_appliance:9.4.0.0:*:*:*:*:*:*:*","cpe:2.3:a:ibm:mq_appliance:9.4.1.0:*:*:*:*:*:*:*"],"product":"MQ Appliance","vendor":"IBM","versions":[{"lessThanOrEqual":"9.4.0.26","status":"affected","version":"9.4.0.0","versionType":"semver"},{"lessThanOrEqual":"9.4.5.3","status":"affected","version":"9.4.1.0","versionType":"semver"},{"lessThanOrEqual":"10.0.0.5","status":"affected","version":"10.0.0.1","versionType":"semver"}]}],"descriptions":[{"lang":"en","supportingMedia":[{"base64":false,"type":"text/html","value":"<p>IBM MQ 9.4.0.0 to 9.4.0.26, 9.4.1.0 to 9.4.5.3, and 10.0.0.1 to 10.0.0.5 could allow an authenticated attacker to obtain sensitive information or cause a denial of service due to improper validation of message header structure length fields.</p>"}],"value":"IBM MQ 9.4.0.0 to 9.4.0.26, 9.4.1.0 to 9.4.5.3, and 10.0.0.1 to 10.0.0.5 could allow an authenticated attacker to obtain sensitive information or cause a denial of service due to improper validation of message header structure length fields."}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"LOW","baseScore":5.4,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"NONE","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:L","version":"3.1"},"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}]}],"problemTypes":[{"descriptions":[{"cweId":"CWE-124","description":"CWE-124 Buffer Underwrite ('Buffer Underflow')","lang":"en","type":"CWE"}]}],"providerMetadata":{"dateUpdated":"2026-11-04T20:25:41.490Z","orgId":"9a959283-ebb5-44b6-b705-dcc2bbced522","shortName":"ibm"},"references":[{"tags":["vendor-advisory","patch"],"url":"https://www.ibm.com/support/pages/node/7293035"}],"solutions":[{"lang":"en","supportingMedia":[{"base64":false,"type":"text/html","value":"<p>This vulnerability is addressed under APAR DT500605.</p><p>IBM strongly recommends addressing the vulnerability now.</p><p><strong>IBM MQ Appliance version 9.4 LTS</strong><br/>Apply <a href=\"https://www.ibm.com/support/fixcentral/swg/selectFixes?parent=ibm~WebSphere&amp;product=ibm/WebSphere/IBM+MQ+Appliance+M2000&amp;function=fixId&amp;fixids=9.4.0.30-IBM-MQ-Appliance+&amp;includeSupersedes=1\" rel=\"nofollow\">IBM MQ Appliance fix pack 9.4.0.30</a>, or later firmware.</p><p><strong>IBM MQ Appliance version 9.4 CD - M2003</strong><br/>Upgrade to <a href=\"https://www.ibm.com/support/fixcentral/swg/selectFixes?parent=ibm~WebSphere&amp;product=ibm/WebSphere/IBM+MQ+Appliance+M2000&amp;function=fixId&amp;fixids=10.0.0.6-IBM-MQ-Appliance+&amp;includeSupersedes=1\" rel=\"nofollow\">IBM MQ Appliance 10.0.0.6</a>, or later firmware.</p><p><strong>IBM MQ Appliance version 9.4 CD - M2002</strong><br/>Apply <a href=\"https://www.ibm.com/support/fixcentral/swg/selectFixes?parent=ibm~WebSphere&amp;product=ibm/WebSphere/IBM+MQ+Appliance+M2000&amp;function=fixId&amp;fixids=9.4.5.4-IBM-MQ-Appliance+&amp;includeSupersedes=1\" rel=\"nofollow\">IBM MQ Appliance cumulative security update 9.4.5.4</a>, or later firmware.</p><p><strong>IBM MQ Appliance version 10 LTS</strong><br/>Apply <a href=\"https://www.ibm.com/support/fixcentral/swg/selectFixes?parent=ibm~WebSphere&amp;product=ibm/WebSphere/IBM+MQ+Appliance+M2000&amp;function=fixId&amp;fixids=10.0.0.6-IBM-MQ-Appliance+&amp;includeSupersedes=1\" rel=\"nofollow\">IBM MQ Appliance cumulative security update 10.0.0.6</a>, or later firmware.</p>"}],"value":"This vulnerability is addressed under APAR DT500605.\n\n\n\nIBM strongly recommends addressing the vulnerability now.\n\n\n\nIBM MQ Appliance version 9.4 LTS\nApply  IBM MQ Appliance fix pack 9.4.0.30 https://www.ibm.com/support/fixcentral/swg/selectFixes , or later firmware.\n\n\n\nIBM MQ Appliance version 9.4 CD - M2003\nUpgrade to  IBM MQ Appliance 10.0.0.6 https://www.ibm.com/support/fixcentral/swg/selectFixes , or later firmware.\n\n\n\nIBM MQ Appliance version 9.4 CD - M2002\nApply  IBM MQ Appliance cumulative security update 9.4.5.4 https://www.ibm.com/support/fixcentral/swg/selectFixes , or later firmware.\n\n\n\nIBM MQ Appliance version 10 LTS\nApply  IBM MQ Appliance cumulative security update 10.0.0.6 https://www.ibm.com/support/fixcentral/swg/selectFixes , or later firmware."}],"title":"IBM MQ Appliance is affected by an improper validation vulnerability"}},"cveMetadata":{"assignerOrgId":"9a959283-ebb5-44b6-b705-dcc2bbced522","assignerShortName":"ibm","cveId":"CVE-2026-12538","datePublished":"2026-11-04T20:25:41.490Z","dateReserved":"2026-06-17T15:22:07.491Z","dateUpdated":"2026-11-04T20:25:41.490Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-11-04 21:18:11","lastModifiedDate":"2026-11-04 21:18:11","problem_types":["CWE-124","CWE-124 CWE-124 Buffer Underwrite ('Buffer Underflow')"],"metrics":{"cvssMetricV31":[{"source":"psirt@us.ibm.com","type":"Primary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:L","baseScore":5.4,"baseSeverity":"MEDIUM","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"LOW","integrityImpact":"NONE","availabilityImpact":"LOW"},"exploitabilityScore":2.8,"impactScore":2.5}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"12538","Ordinal":"1","Title":"IBM MQ Appliance is affected by an improper validation vulnerabi","CVE":"CVE-2026-12538","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"12538","Ordinal":"1","NoteData":"IBM MQ 9.4.0.0 to 9.4.0.26, 9.4.1.0 to 9.4.5.3, and 10.0.0.1 to 10.0.0.5 could allow an authenticated attacker to obtain sensitive information or cause a denial of service due to improper validation of message header structure length fields.","Type":"Description","Title":"IBM MQ Appliance is affected by an improper validation vulnerabi"}]}}}