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NULL Pointer Dereference


Severity High
Score 7.5/10


A NULL pointer dereference vulnerability exists in the "xpath.c:xmlXPathCompOpEval()" function of libxml2 through 2.9.8 when parsing an invalid XPath expression in the "XPATH_OP_AND" or "XPATH_OP_OR" case. Applications processing untrusted XSL format inputs with the use of the libxml2 library may be vulnerable to a denial of service attack due to a crash of the application.

  • LOW
  • NONE
  • NONE
  • NONE
  • NONE
  • HIGH

CWE-476 - NULL Pointer Dereference

A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit.

Advisory Timeline

  • Published