Уязвимость функции очистки объекта XML библиотеки анализа XML-документов libxml2, позволяющая нарушителю вызвать отказ в обслуживании

Уязвимость функции xmlParseNameComplex() библиотеки анализа XML-документов libxml2, позволяющая нарушителю выполнить произвольный код или вызвать отказ в обслуживании

Уязвимость библиотеки для обработки разметки XML и HTML Lxml, связанная с разыменованием указателя NULL, позволяющая нарушителю вызвать отказ в обслуживании

Уязвимость библиотеки Libxml2, связанная с неконтролируемой рекурсией, позволяющая нарушителю вызвать отказ в обслуживании

NULL Pointer Dereference allows attackers to cause a denial of service (or application crash). This only applies when lxml is used together with libxml2 2.9.10 through 2.9.14. libxml2 2.9.9 and earlier are not affected. It allows triggering crashes through forged input data, given a vulnerable code sequence in the application. The vulnerability is caused by the iterwalk function (also used by the canonicalize function). Such code shouldn't be in wide-spread use, given that parsing + iterwalk would usually be replaced with the more efficient iterparse function. However, an XML converter that serialises to C14N would also be vulnerable, for example, and there are legitimate use cases for this code sequence. If untrusted input is received (also remotely) and processed via iterwalk function, a crash can be triggered.

An issue was discovered in libxml2 before 2.10.3. When parsing a multi-gigabyte XML document with the XML_PARSE_HUGE parser option enabled, several integer counters can overflow. This results in an attempt to access an array at a negative 2GB offset, typically leading to a segmentation fault.

An issue was discovered in libxml2 before 2.10.3. Certain invalid XML entity definitions can corrupt a hash table key, potentially leading to subsequent logic errors. In one case, a double-free can be provoked.

Uncontrolled recursion in XPath evaluation in libxml2 up to and including version 2.9.14 allows a local attacker to cause a stack overflow via crafted expressions. XPath processing functions `xmlXPathRunEval`, `xmlXPathCtxtCompile`, and `xmlXPathEvalExpr` were resetting recursion depth to zero before making potentially recursive calls. When such functions were called recursively this could allow for uncontrolled recursion and lead to a stack overflow. These functions now preserve recursion depth across recursive calls, allowing recursion depth to be controlled.

lxml NULL Pointer Dereference allows attackers to cause a denial of service