## React Native 0.62.3 Patches Critical ReDoS Vulnerability in validateBaseUrl Function
A critical security flaw in the popular React Native framework has been patched, exposing countless mobile applications to potential denial-of-service attacks. The vulnerability, a regular expression denial of-service (ReDoS) within the `validateBaseUrl` function, could cause apps to consume excessive resources, become unresponsive, or crash entirely. This flaw was not a minor bug but a systemic weakness introduced in version 0.59.0, leaving a wide swath of the ecosystem vulnerable until its fix in version 0.64.1.

The issue is detailed in GitHub Security Advisory GHSA-7f53-fmmv-mfjv, which confirms the vulnerability affects all React Native versions from 0.59.0 up to, but not including, 0.62.3. The patch release, version 0.62.3, was specifically targeted to address this security hole. The nature of a ReDoS attack means a maliciously crafted URL could trigger catastrophic performance degradation by exploiting inefficient regular expression patterns, effectively stalling an application's core networking functions.

This patch underscores the persistent and often hidden risks in foundational open-source dependencies. For development teams, the advisory serves as an urgent mandate to upgrade from any version between 0.59.0 and 0.62.2. Failure to apply this update leaves applications exposed to a vector that could be exploited to disrupt service availability. The fix in 0.62.3, while also including updates for Xcode 12.5 compatibility, is primarily a critical security mitigation that developers cannot afford to ignore.
---
- **Source**: GitHub Issues
- **Sector**: The Lab
- **Tags**: cybersecurity, software vulnerability, ReDoS, open-source, mobile development
- **Credibility**: unverified
- **Published**: 2026-03-30 11:27:13
- **ID**: 41098
- **URL**: https://whisperx.ai/en/intel/41098