{"affected":[{"defaultStatus":"unaffected","product":"libexpat","source":"CNA: mitre","vendor":"libexpat project","versions":[{"lessThan":"2.8.2","status":"affected","version":"0","versionType":"semver"}]},{"defaultStatus":"unknown","product":"SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0)","source":"ADP: siemens-SADP","vendor":"Siemens","versions":[{"lessThan":"*","status":"affected","version":"V3.1.7","versionType":"custom"}]},{"defaultStatus":"unknown","product":"SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0)","source":"ADP: siemens-SADP","vendor":"Siemens","versions":[{"lessThan":"*","status":"affected","version":"V3.1.7","versionType":"custom"}]},{"defaultStatus":"unknown","product":"SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0)","source":"ADP: siemens-SADP","vendor":"Siemens","versions":[{"lessThan":"*","status":"affected","version":"V3.1.7","versionType":"custom"}]},{"defaultStatus":"unknown","product":"SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AC0)","source":"ADP: siemens-SADP","vendor":"Siemens","versions":[{"lessThan":"*","status":"affected","version":"V3.1.7","versionType":"custom"}]},{"defaultStatus":"unknown","product":"SIPLUS S7-1500 CPU 1518-4 PN/DP MFP (6AG1518-4AX00-4AC0)","source":"ADP: siemens-SADP","vendor":"Siemens","versions":[{"lessThan":"*","status":"affected","version":"V3.1.7","versionType":"custom"}]}],"cveId":"CVE-2026-56131","cwes":["CWE-416"],"description":"libexpat before 2.8.2 lacks handler call depth tracking for calls to XML_ResumeParser from within handlers in cases of a policy violation. Thus, a use-after-free can occur (similar to the CVE-2026-50219 situation).","epss":{"date":"2026-11-09","percentile":0.07048,"score":0.00175},"exploits":[],"kev":null,"metrics":[{"score":4.9,"severity":"medium","source":"CNA: mitre","vector":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L","version":"3.1"}],"modifiedAt":1794314916692,"publishedAt":1781837796041,"references":[{"source":"CNA: mitre","tags":[],"url":"https://github.com/libexpat/libexpat/pull/1267"},{"source":"ADP: siemens-SADP","tags":[],"url":"https://cert-portal.siemens.com/productcert/html/ssa-457936.html"}],"remediation":[],"revision":"62f7376eece05371d9345949ec0e89c9f7b5a230ca10ba0384341d054ba20e45","sources":[{"modifiedAt":1794314916692,"name":"CNA: mitre","retrievedAt":1794316700276,"url":"https://www.cve.org/CVERecord?id=CVE-2026-56131"},{"modifiedAt":null,"name":"FIRST EPSS","retrievedAt":1794316711982,"url":"https://api.first.org/data/v1/epss?cve=CVE-2026-56131"}],"ssvc":{"assessedAt":1782140285598,"automatable":"no","exploitation":"none","source":"ADP: CISA-ADP","technicalImpact":"partial"},"status":"published","title":"CVE-2026-56131","updatedAt":1794316711982}