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Advisories

libexpat through 2.9.0 NULL Pointer Dereference via External Entity Subparser

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Severity
high
Date
Affecting

  • libexpat <= 2.9.0

CWE
  • CWE-476 NULL Pointer Dereference
CVSS
8.2
CVSS V4 Vector
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Credit
Minkyung Park, Sebastian Pipping
Description
libexpat through 2.9.0 contains a NULL pointer dereference vulnerability in externalEntityInitProcessor2() in lib/xmlparse.c that mishandles the XML_TOK_NONE token from empty input. Attackers who control stream chunking can force an empty non-final first parse on an external entity subparser, causing a later parse to crash the application.

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