CVE-2019-19507: Improper Authentication

December 4, 2019 (updated August 19, 2021)

In jpv (aka Json Pattern Validator) before 2.1.1, compareCommon() can be bypassed because certain internal attributes can be overwritten via a conflicting name, as demonstrated by ‘constructor’: {’name’:‘Array’}. This affects validate(). Hence, a crafted payload can overwrite this builtin attribute to manipulate the type detection result.

References

github.com/advisories/GHSA-rh46-3fgc-mvrf
github.com/manvel-khnkoyan/jpv/issues/6
nvd.nist.gov/vuln/detail/CVE-2019-19507
www.npmjs.com/package/jpv

Code Behaviors & Features

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