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Advisories

json-smart through 2.6.0 Strict-Mode Validation Bypass via 0x1A Character

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Severity
medium
Date
Affecting

  • json-smart <= 2.6.0

CWE
  • CWE-147 Improper Neutralization of Input Terminators
CVSS
6.9
CVSS V4 Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
Credit
Yu Bao, PayPal Cyber Security Team
Description
json-smart through 2.6.0 contains an input validation bypass vulnerability that allows attackers to evade strict-mode trailing-data checks by inserting a literal 0x1A character. Attackers can append 0x1A and malformed content to pass JSONValue.parseStrict or isValidJsonStrict validation, creating parser differentials with downstream parsers like Jackson or Gson.

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