## AssertJ Core 3.27.7 Patches Critical XXE Vulnerability in XML Comparison Feature
A critical security vulnerability in the popular Java testing library AssertJ has been patched, forcing a mandatory update for millions of projects. The flaw, tracked as CVE-2026-24400, is an XML External Entity (XXE) vulnerability that resides within the library's `isXmlEqualTo` assertion. This function, used to compare XML strings, can be exploited when parsing untrusted or malicious XML input, potentially allowing attackers to read sensitive files from the server or perform denial-of-service attacks.

The vulnerability is located in the `org.assertj.core.util.xml.XmlStringPrettyFormatter` class. The update from version 3.27.6 to 3.27.7, marked as a security fix, disables external entity resolution by default to mitigate the risk. This is a direct, targeted fix for a specific component used in unit and integration tests across countless Java applications, from enterprise backends to open-source frameworks.

The patch is being distributed via automated dependency managers like RenovateBot, signaling its high priority. While the impact is confined to code paths that use the vulnerable assertion on untrusted data, the widespread use of AssertJ in development pipelines means the potential attack surface is significant. Organizations must update their dependencies promptly, as the vulnerability could be chained with other exploits if a test suite inadvertently processes attacker-controlled XML.
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- **Source**: GitHub Issues
- **Sector**: The Lab
- **Tags**: CVE-2026-24400, Java, XXE, Supply Chain Security, Open Source
- **Credibility**: unverified
- **Published**: 2026-04-21 19:23:06
- **ID**: 74715
- **URL**: https://whisperx.ai/en/intel/74715