{"id":"AZL-96605","summary":"CVE-2026-66046 affecting package expat 2.8.2-1","details":"Expat through 2.8.3 contains a denial of service vulnerability caused by quadratic algorithmic complexity in the storeAtts() function in xmlparse.c, where processing N specified attributes with non-normalized values triggers an O(N^2) linear scan of elementType-\u003edefaultAtts to determine CDATA status. A remote unauthenticated attacker can supply a single well-formed XML document of a few megabytes to an application parsing untrusted XML to cause excessive CPU consumption, resulting in denial of service without requiring authentication, external entity resolution, or non-default parser options.","modified":"2026-08-28T17:48:14.829995456Z","published":"2026-08-18T15:16:57Z","upstream":["CVE-2026-66046"],"references":[{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-66046"}],"affected":[{"package":{"name":"expat","ecosystem":"Azure Linux:3","purl":"pkg:rpm/azure-linux/expat"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"2.8.2-1"}]}],"database_specific":{"source":"https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-96605.json"}}],"schema_version":"1.9.0"}