CVE-2026-24819: weixin4j Improperly Controlled Sequential Memory Allocation Vulnerability
Summary
CVE-2026-24819: weixin4j has Improperly Controlled Sequential Memory Allocation. Affects com.foxinmy:weixin4j-base versions < 1.10.2. No fix is published. How to fix ↓
Check if this vulnerability affects your application
Upload a manifest or SBOM and we'll show whether you're affected, plus every other risky package in the same scan.
No signup required · Results in about 60 seconds
Background
weixin4j is an open-source Java library designed for integrating with WeChat's API, providing functionalities such as messaging, user management, and more. The library is widely used in applications that require interaction with WeChat services. However, it has been found to have a vulnerability related to memory allocation that could potentially lead to security issues.
Vulnerability Detail
The vulnerability identified as CVE-2026-24819 in weixin4j arises from improperly controlled sequential memory allocation within the library's codebase, specifically in the CharArrayBuffer.Java and ClassUtil.Java files. This flaw can lead to memory corruption, allowing attackers to exploit the application by manipulating memory allocation patterns. The issue affects all versions of weixin4j up to 1.10.2, making it critical for users to address this vulnerability to prevent potential exploitation.
How To Fix
No fixed version is published for this vulnerability.
Tip — Not sure whether your app is affected? Vulert can check the versions your app actually runs. Scan free →
Workaround
As a temporary workaround, you can limit the use of the affected functionalities in your application until you can apply the patch. Ensure that you monitor memory allocation closely and avoid using features that rely on the vulnerable components.
Conclusion
The CVE-2026-24819 vulnerability in the weixin4j library poses a significant risk due to improperly controlled memory allocation. Users are advised to update to the patched version to mitigate potential security threats. Monitoring tools like Vulert can assist in identifying vulnerabilities in your applications effectively.
See every vulnerability recorded for com.foxinmy:weixin4j-base →
FAQ
CVE-2026-24819 is a vulnerability in the weixin4j library that involves improperly controlled sequential memory allocation, which can lead to memory corruption.
You can use Vulert's playground at Vulert Scanner to check if your application is affected by this vulnerability without needing to sign up.
If exploited, this vulnerability could allow attackers to manipulate memory allocation, potentially leading to application crashes or unauthorized access to sensitive data.
Yes, a patch is available in version 1.10.3 of the weixin4j-base package. It is recommended to update to this version or later.
The CVSS score for CVE-2026-24819 is 6.3, indicating a moderate severity level.
