Moderate Security Update for assertj-core: Information Disclosure and Denial of Service Vulnerability
Summary
RLSA-2026:59372: Moderate: assertj-core security update. Affects assertj-core versions < 0:3.24.2-9.el10_2.1. Fixed in 0:3.24.2-9.el10_2.1. How to fix ↓
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Background
assertj-core is a popular open-source library that provides a rich and intuitive set of strongly-typed assertions for unit testing in Java applications, compatible with testing frameworks like JUnit and TestNG. It enhances the readability and maintainability of tests by allowing developers to write assertions in a fluent style. However, recent vulnerabilities have raised concerns regarding its security, particularly related to XML External Entity (XXE) processing, which can lead to information disclosure and denial of service attacks.
Vulnerability Detail
The vulnerability identified as CVE-2026-24400 in assertj-core is a security flaw that arises from improper handling of XML input. This flaw allows attackers to exploit XML External Entities (XXE), potentially leading to unauthorized access to sensitive information and causing denial of service conditions. The impact of this vulnerability is significant, as it can compromise the integrity of applications that rely on assertj-core for testing, making it crucial for developers to address this issue promptly.
How To Fix
Minimum fixed version
0:3.24.2-9.el10_2.1
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
If immediate patching is not feasible, consider disabling XML processing in your application or validating XML inputs strictly to prevent the exploitation of XXE vulnerabilities. This can be done by configuring your XML parser to disallow external entity references.
Conclusion
The assertj-core library has a moderate vulnerability (CVE-2026-24400) that can lead to information disclosure and denial of service through improper XML handling. It is essential for developers to update to the patched version to secure their applications. Utilizing tools like Vulert can help monitor and identify vulnerabilities in real-time.
See every vulnerability recorded for assertj-core →
FAQ
CVE-2026-24400 is a vulnerability in the assertj-core library that allows for information disclosure and denial of service through XML External Entity (XXE) attacks.
If your application uses assertj-core for testing, it may be susceptible to unauthorized access to sensitive data and potential service disruptions due to this vulnerability.
The CVSS score for CVE-2026-24400 is 6.1, indicating a moderate level of severity.
You can use Vulert, which monitors and alerts for open-source vulnerabilities in your software. Visit Vulert Scanner to check if your application is affected without requiring any signup.
If you cannot update the package right away, consider implementing workarounds such as disabling XML processing or strictly validating XML inputs to mitigate the risk.
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