{"attribution":"This product uses data from the NVD API but is not endorsed or certified by the NVD.","cve":{"id":"CVE-2026-86140","sourceIdentifier":"cve@mitre.org","published":"2026-09-05T05:17:12.877","lastModified":"2026-09-15T19:39:17.010","vulnStatus":"Analyzed","cveTags":[],"descriptions":[{"lang":"en","value":"In libxml2 before 2.15.4, xmlSnprintfElements in valid.c has a strcat stack-based buffer overflow."}],"affected":[{"source":"cve@mitre.org","affectedData":[{"vendor":"xmlsoft","product":"libxml2","defaultStatus":"unaffected","versions":[{"version":"0","lessThan":"2.15.4","versionType":"semver","status":"affected"}]}]}],"metrics":{"cvssMetricV31":[{"source":"cve@mitre.org","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L","baseScore":8.0,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"LOW"},"exploitabilityScore":2.5,"impactScore":5.5},{"source":"nvd@nist.gov","type":"Primary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":1.8,"impactScore":5.9}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-09-08T18:06:03.098551Z","id":"CVE-2026-86140","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"weaknesses":[{"source":"cve@mitre.org","type":"Secondary","description":[{"lang":"en","value":"CWE-121"}]}],"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:xmlsoft:libxml2:*:*:*:*:*:*:*:*","versionEndExcluding":"2.15.4","matchCriteriaId":"18340BC5-55BB-416E-9928-3754A7AE17F7"}]}]}],"references":[{"url":"https://github.com/GNOME/libxml2/commit/d1686f91dbda141a752200419d35639fd6b38340","source":"cve@mitre.org","tags":["Patch"]},{"url":"https://github.com/GNOME/libxml2/compare/v2.15.3...v2.15.4","source":"cve@mitre.org","tags":["Release Notes"]}]}}