Security Update for AssertJ Core: Mitigating Information Disclosure and Denial of Service Vulnerabilities
Summary
ALSA-2026:60215: Moderate: assertj-core security update. Affects assertj-core versions < 3.19.0-9.el9_8.1. Fixed in 3.19.0-9.el9_8.1. How to fix ↓
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Background
AssertJ Core is a popular Java library that provides a rich set of strongly-typed assertions for unit testing, compatible with both JUnit and TestNG. It enhances the testing experience by allowing developers to write more readable and maintainable tests. However, a recent security vulnerability has been identified that could potentially expose sensitive information and lead to denial of service attacks.
Vulnerability Detail
The vulnerability, identified as CVE-2026-24400, is related to XML External Entity (XXE) processing within AssertJ Core. This issue arises when XML input is improperly handled, allowing attackers to exploit the system by sending crafted XML data. The consequences of this vulnerability include information disclosure, where sensitive data may be leaked, and denial of service, where the application could become unresponsive due to excessive resource consumption.
How To Fix
Minimum fixed version
3.19.0-9.el9_8.1
This is the first release that contains the fix.
sudo dnf update assertj-coreTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
As a temporary workaround, you can disable XML processing in your application if it is not required. This can help prevent the exploitation of the XXE vulnerability until you are able to apply the update. However, this may limit certain functionalities that rely on XML processing.
Conclusion
The AssertJ Core library has a critical vulnerability that could lead to information disclosure and denial of service. It is essential to update to the latest patched version to protect your applications. Additionally, using tools like Vulert can help you monitor and manage vulnerabilities effectively.
See every vulnerability recorded for assertj-core →
FAQ
CVE-2026-24400 is a security vulnerability in AssertJ Core that allows for information disclosure and denial of service through improper handling of XML input.
You can use Vulert, which monitors open-source vulnerabilities in your software using just a manifest file. Visit Vulert Scanner to check if your application is affected by this vulnerability.
The potential impacts include unauthorized access to sensitive information and application downtime due to denial of service attacks.
Yes, a patch is available. Update to AssertJ Core version 3.19.0-9.el9_8.1 or later to mitigate the vulnerability.
If you cannot update immediately, consider disabling XML processing in your application as a temporary workaround to reduce the risk of exploitation.
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