CVE-2020-1920: Facebook React-Native

High severity, CVSS 7.5. EPSS: 1.4% chance of exploitation in the next 30 days.

A regular expression denial of service (ReDoS) vulnerability in the validateBaseUrl function can cause the application to use excessive resources, become unresponsive, or crash. This was introduced in react-native version 0.59.0 and fixed in version 0.64.1.

Affected products

• Facebook React-Native: from 0.59.0, before 0.64.1 (fixed in 0.64.1)

Published 2021-06-01. Last modified 2026-06-17.