CVE-2016-4472High· 8.1▾ TwilightThe 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 vulnerab…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 44.6 · likelihood 2.4 · exploitation 0
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Exploit-prediction probability, daily snapshots since Oct 8.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via NVD
Last analysed / modified upstream
12%
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.
libexpat <= 2.1.1ubuntu_linux = 12.04policy_auditor < 6.5.1python >= 2.7.0, < 2.7.15python >= 3.3.0, < 3.3.7python >= 3.4.0, < 3.4.7python >= 3.5.0, < 3.5.4python >= 3.6.0, < 3.6.2Upgrade past the affected range:
policy_auditor 6.5.1python 3.6.2Connected by shared product, vendor, weakness, or advisory.
CVE-2013-0340Medium· 6.8expat 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 HT…
CVE-2016-0718Critical· 9.8Expat allows context-dependent attackers to cause a denial of service (crash) or possibly execute arbitrary code via a malformed input document, which triggers a buffer overflow.
CVE-2017-9233High· 7.5XML 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-2026-77214High· 8.2libexpat before commit 13c5f63 contains a heap buffer over-read vulnerability in xmlparse.c
CVE-2026-102633Medium· 5.9libexpat versions 2.7.2 through 2.8.5 contain an integer overflow vulnerability in expat_realloc() function on 32-bit platforms when computing allocation sizes
CVE-2026-93990High· 7.5Expat before 2.8.5 fails to validate that a high surrogate in UTF-16 input is followed by a low surrogate, allowing malformed UTF-16 sequences to be accepted