CVE-2019-19507: JSON Pattern Validator Project JSON Pattern Validator

Medium severity, CVSS 5.3. EPSS: 1% chance of exploitation in the next 30 days.

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.

Affected products

• JSON Pattern Validator Project JSON Pattern Validator: before 2.1.1 (fixed in 2.1.1)

Published 2019-12-02. Last modified 2026-06-17.