CVE-2013-0340

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.

EPSS

19% chance of exploitation in the next 30 days; higher than 97% of CVEs (scores of 2026-10-25)

CWE

CWE-611

Published

2014-01-21

Modified

2026-10-14

Record from

the NVD, synced 2026-10-19

Affected

• apple:ipados
• apple:iphone_os
• apple:macos
• apple:tvos
• apple:watchos
• libexpat_project:libexpat
• python:python

References

• http://openwall.com/lists/oss-security/2013/02/22/3
• http://seclists.org/fulldisclosure/2021/Oct/61
• http://seclists.org/fulldisclosure/2021/Oct/62
• http://seclists.org/fulldisclosure/2021/Oct/63
• http://seclists.org/fulldisclosure/2021/Sep/33

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