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CVE-2025-5896: Inefficient Regular Expression Complexity in tarojs taro

Medium
VulnerabilityCVE-2025-5896cvecve-2025-5896
Published: Mon Jun 09 2025 (06/09/2025, 20:31:07 UTC)
Source: CVE Database V5
Vendor/Project: tarojs
Product: taro

Description

A vulnerability was found in tarojs taro up to 4.1.1. It has been declared as problematic. This vulnerability affects unknown code of the file taro/packages/css-to-react-native/src/index.js. The manipulation leads to inefficient regular expression complexity. The attack can be initiated remotely. Upgrading to version 4.1.2 is able to address this issue. The name of the patch is c2e321a8b6fc873427c466c69f41ed0b5e8814bf. It is recommended to upgrade the affected component.

AI-Powered Analysis

AILast updated: 07/11/2025, 00:02:37 UTC

Technical Analysis

CVE-2025-5896 is a medium severity vulnerability affecting the tarojs taro framework versions up to 4.1.1, specifically in the file taro/packages/css-to-react-native/src/index.js. The issue arises from inefficient regular expression complexity, which can be exploited remotely without requiring user interaction or elevated privileges. This vulnerability is a form of Regular Expression Denial of Service (ReDoS), where an attacker crafts input that causes the regular expression engine to consume excessive CPU resources, leading to degraded performance or service unavailability. The vulnerability does not compromise confidentiality or integrity directly but impacts availability by potentially causing application slowdowns or crashes. The vendor has addressed this issue in version 4.1.2, with a patch identified by commit c2e321a8b6fc873427c466c69f41ed0b5e8814bf. No known exploits are currently reported in the wild. The CVSS 4.0 vector indicates network attack vector, low attack complexity, no privileges required, no user interaction, and low impact on availability, with no impact on confidentiality or integrity, resulting in a score of 5.3 (medium severity).

Potential Impact

For European organizations using the tarojs taro framework, particularly versions 4.1.0 and 4.1.1, this vulnerability could lead to service disruptions due to resource exhaustion caused by maliciously crafted inputs exploiting the inefficient regular expression. This can affect web applications or services relying on taro for CSS to React Native transformations, potentially causing denial of service conditions. While the vulnerability does not allow data breaches or code execution, the availability impact can disrupt business operations, degrade user experience, and increase operational costs due to mitigation efforts. Organizations in sectors with high availability requirements, such as finance, healthcare, and e-commerce, may face operational risks. Additionally, if exploited at scale, it could be used as part of a larger distributed denial of service (DDoS) campaign targeting applications using this framework.

Mitigation Recommendations

European organizations should prioritize upgrading the tarojs taro framework to version 4.1.2 or later, which contains the patch addressing this vulnerability. In addition to upgrading, organizations should implement input validation and sanitization to limit the complexity and length of inputs processed by the vulnerable regular expressions. Monitoring application performance metrics and setting thresholds for unusual CPU usage can help detect potential exploitation attempts early. Employing Web Application Firewalls (WAFs) with rules to detect and block suspicious payloads targeting regex processing can further reduce risk. For development teams, reviewing and refactoring regular expressions to avoid catastrophic backtracking and using regex libraries or engines that provide safeguards against ReDoS attacks is recommended. Finally, maintaining an inventory of applications and dependencies using tarojs taro will ensure timely patch management and vulnerability response.

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Technical Details

Data Version
5.1
Assigner Short Name
VulDB
Date Reserved
2025-06-09T06:53:29.593Z
Cvss Version
4.0
State
PUBLISHED

Threat ID: 68487f541b0bd07c3938a0b1

Added to database: 6/10/2025, 6:54:12 PM

Last enriched: 7/11/2025, 12:02:37 AM

Last updated: 8/6/2025, 8:22:33 AM

Views: 10

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