| CVE-2016-4472 | Hig | 0.53 | 8.1 | 0.02 | | Jun 30, 2016 | The overflow protection in Expat is removed by compilers with certain optimization settings, which allows remote attackers to cause a denial of service (crash) or possibly execute arbitrary code via crafted XML data. NOTE: this vulnerability exists because of an incomplete fix for CVE-2015-1283 and CVE-2015-2716. |
| CVE-2017-11742 | Hig | 0.51 | 7.8 | 0.00 | | Jul 30, 2017 | The writeRandomBytes_RtlGenRandom function in xmlparse.c in libexpat in Expat 2.2.1 and 2.2.2 on Windows allows local users to gain privileges via a Trojan horse ADVAPI32.DLL in the current working directory because of an untrusted search path, aka DLL hijacking. |
| CVE-2017-9233 | Hig | 0.49 | 7.5 | 0.00 | | Jul 25, 2017 | XML External Entity vulnerability in libexpat 2.2.0 and earlier (Expat XML Parser Library) allows attackers to put the parser in an infinite loop using a malformed external entity definition from an external DTD. |
| CVE-2016-5300 | Hig | 0.49 | 7.5 | 0.02 | | Jun 16, 2016 | The XML parser in Expat does not use sufficient entropy for hash initialization, which allows context-dependent attackers to cause a denial of service (CPU consumption) via crafted identifiers in an XML document. NOTE: this vulnerability exists because of an incomplete fix for CVE-2012-0876. |
| CVE-2025-59375 | Hig | 0.42 | 7.5 | 0.00 | | Sep 15, 2025 | libexpat in Expat before 2.7.2 allows attackers to trigger large dynamic memory allocations via a small document that is submitted for parsing. |
| CVE-2012-6702 | Med | 0.38 | 5.9 | 0.01 | | Jun 16, 2016 | Expat, when used in a parser that has not called XML_SetHashSalt or passed it a seed of 0, makes it easier for context-dependent attackers to defeat cryptographic protection mechanisms via vectors involving use of the srand function. |
| CVE-2026-41080 | Low | 0.19 | 2.9 | 0.00 | | Apr 16, 2026 | libexpat before 2.8.0 uses insufficient entropy, and thus hash flooding can occur via a crafted XML document. |
| CVE-2015-1283 | | 0.00 | — | 0.01 | | Jul 23, 2015 | Multiple integer overflows in the XML_GetBuffer function in Expat through 2.1.0, as used in Google Chrome before 44.0.2403.89 and other products, allow remote attackers to cause a denial of service (heap-based buffer overflow) or possibly have unspecified other impact via crafted XML data, a related issue to CVE-2015-2716. |
| CVE-2013-0340 | | 0.00 | — | 0.00 | | Jan 21, 2014 | 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. |
| CVE-2012-1148 | | 0.00 | — | 0.01 | | Jul 3, 2012 | Memory leak in the poolGrow function in expat/lib/xmlparse.c in expat before 2.1.0 allows context-dependent attackers to cause a denial of service (memory consumption) via a large number of crafted XML files that cause improperly-handled reallocation failures when expanding entities. |
| CVE-2012-1147 | | 0.00 | — | 0.01 | | Jul 3, 2012 | readfilemap.c in expat before 2.1.0 allows context-dependent attackers to cause a denial of service (file descriptor consumption) via a large number of crafted XML files. |
| CVE-2012-0876 | | 0.00 | — | 0.00 | | Jul 3, 2012 | The XML parser (xmlparse.c) in expat before 2.1.0 computes hash values without restricting the ability to trigger hash collisions predictably, which allows context-dependent attackers to cause a denial of service (CPU consumption) via an XML file with many identifiers with the same value. |
| CVE-2009-3560 | | 0.00 | — | 0.03 | | Dec 4, 2009 | The big2_toUtf8 function in lib/xmltok.c in libexpat in Expat 2.0.1, as used in the XML-Twig module for Perl, allows context-dependent attackers to cause a denial of service (application crash) via an XML document with malformed UTF-8 sequences that trigger a buffer over-read, related to the doProlog function in lib/xmlparse.c, a different vulnerability than CVE-2009-2625 and CVE-2009-3720. |
| CVE-2009-3720 | | 0.00 | — | 0.02 | | Nov 3, 2009 | The updatePosition function in lib/xmltok_impl.c in libexpat in Expat 2.0.1, as used in Python, PyXML, w3c-libwww, and other software, allows context-dependent attackers to cause a denial of service (application crash) via an XML document with crafted UTF-8 sequences that trigger a buffer over-read, a different vulnerability than CVE-2009-2625. |
