{"affected":[{"product":"MQ Appliance","source":"CNA: ibm","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"}]}],"cveId":"CVE-2026-12538","cwes":["CWE-124"],"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.","epss":{"date":"2026-11-09","percentile":0.26708,"score":0.00333},"exploits":[],"kev":null,"metrics":[{"score":5.4,"severity":"medium","source":"CNA: ibm","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:L","version":"3.1"},{"score":5.4,"severity":"medium","source":"NVD: psirt@us.ibm.com","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:L","version":"3.1"}],"modifiedAt":1794257570449,"publishedAt":1793823941490,"references":[{"source":"CNA: ibm","tags":["vendor-advisory","patch"],"url":"https://www.ibm.com/support/pages/node/7293035"},{"source":"psirt@us.ibm.com","tags":[],"url":"https://www.ibm.com/support/pages/node/7293035"}],"remediation":[{"kind":"fix","source":"CNA: ibm","text":"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."},{"kind":"fix","source":"CNA: ibm","text":"The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.","url":"https://www.ibm.com/support/pages/node/7293035"}],"revision":"4fba36d103cd0199836b086e6bcb2c1fb629e64668aca0b98ba1a570ec430fe2","sources":[{"modifiedAt":1794257570449,"name":"CNA: ibm","retrievedAt":1794258589420,"url":"https://www.cve.org/CVERecord?id=CVE-2026-12538"},{"modifiedAt":1793827091563,"name":"NVD","retrievedAt":1793838294141,"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-12538"},{"modifiedAt":null,"name":"FIRST EPSS","retrievedAt":1794258612845,"url":"https://api.first.org/data/v1/epss?cve=CVE-2026-12538"}],"ssvc":{"assessedAt":1794257557371,"automatable":"no","exploitation":"none","source":"ADP: CISA-ADP","technicalImpact":"partial"},"status":"published","title":"IBM MQ Appliance is affected by an improper validation vulnerability","updatedAt":1794258612845}