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Advisories

Expat through 2.8.4 Malformed UTF-16 Acceptance via Unchecked Surrogate

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severity
high
date
Affecting

  • libexpat <= 2.8.4

CWE
  • CWE-176 Improper Handling of Unicode Encoding
CVSS
8.7
CVSS V4 Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
Credit
Kartik Kenchi (netliomax25-code)
Description
Expat through 2.8.4 fails to validate low surrogates following high surrogates in UTF-16 input, allowing malformed UTF-16 sequences to be accepted. Attackers can craft UTF-16 encoded XML with lone high surrogates that consume following code units, hiding markup characters from the parser and enabling XML injection attacks.

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