kind-of 6.x prior to 6.0.3 are vulnerable to a Validation Bypass. A maliciously crafted object can alter the result of the type check, allowing attackers to bypass the type checking validation.
Upgrade to versions 6.0.3 or later.
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publishedAdvisory PublishedMar 9th, 2020
reportedReported by Feng XiaoMar 6th, 2020