expat: Fix of CVE-2026-76957

CVE-2026-76957: fix use-after-free from calling XMLParserFree inside a custom unknown-encoding convert or release callback, by routing both through callUnknownEncodingConvert/callUnknownEncodingRelease so they are covered by the handler call depth tracking...

libexpat before 2.8.2 lacks handler call depth tracking for calls to XML_GetBuffer, XML_Parse, XML_ParseBuffer, XML_ParserFree, or XML_ParserReset from within handlers in cases of a policy violation. Thus, a use-after-free can occur,

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CVE-2026-50219

libexpat before 2.8.2 lacks handler call depth tracking for calls to XMLGetBuffer, XMLParse, XMLParseBuffer, XMLParserFree, or XMLParserReset from within handlers in cases of a policy violation. Thus, a use-after-free can occur,...

CVE-2026-50219: Use After Free

libexpat before 2.8.2 lacks handler call depth tracking for calls to XMLGetBuffer, XMLParse, XMLParseBuffer, XMLParserFree, or XMLParserReset from within handlers in cases of a policy violation. Thus, a use-after-free can occur,...

Use After Free

libexpat.so is vulnerable to use-after-free. The vulnerability exists due to a lack of entity value validations in the XMLParserFree parameter of the parserCreate function in xmlparse.c. An attacker could exploit it to lead to memory consumption resulting in an application crash...