CVE-2019-19507

Severity: medium (CVSS 5.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.0% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2019-12-02 · updated 2026-06-17
Weakness: CWE-287

Description

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

How to fix

Upgrade to a fixed version: Json Pattern Validator Project Json Pattern Validator 2.1.1. Check the vendor advisory for mitigations.

References

https://github.com/manvel-khnkoyan/jpv/issues/6
https://www.npmjs.com/package/jpv
https://github.com/manvel-khnkoyan/jpv/issues/6
https://www.npmjs.com/package/jpv

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