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Generated remediation guidance and an executive summary. No account required.
expat before version 2.4.0 does not properly handle entities expansion unless an application developer uses the XML_SetEntityDeclHandler function, which allows remote attackers to cause a denial of service (resource consumption), send HTTP requests to intranet servers, or read arbitrary files via a crafted XML document, aka an XML External Entity (XXE) issue. NOTE: it could be argued that because expat already provides the ability to disable external entity expansion, the responsibility for resolving this issue lies with application developers; according to this argument, this entry should be REJECTed, and each affected application would need its own CVE.
Cite this page
CVE-2013-0340. CVEDatabase.com. Retrieved 1 May 2026. https://cvedatabase.com/cve/CVE-2013-0340
Use CWE-611, Libexpat Project vendor hub and Libexpat product page to widen CVE-2013-0340 into its surrounding weakness, vendor, and product context.
Compare it with CVE-2024-45492, CVE-2024-45491 and CVE-2025-59375 for nearby disclosures in the same product family.