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Advisories

libexpat through 2.9.0 Integer Overflow in storeAtts via attIndex and nPrefixes

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Severity
high
Date
Affecting

  • libexpat <= 2.9.0

CWE
  • CWE-190 Integer Overflow or Wraparound
CVSS
8.2
CVSS V4 Vector
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Credit
Mirko Swillus, Sebastian Pipping
Description
libexpat through 2.9.0 contains a signed integer overflow vulnerability in storeAtts() in lib/xmlparse.c that allows attackers to trigger out-of-bounds writes via oversized attribute counts. Attackers can supply a multi-gigabyte document with a start tag carrying over 2^30 attributes to overflow attIndex and nPrefixes, crashing applications or corrupting heap memory.

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