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CVE-2026-24400 is an XML External Entity (XXE) vulnerability in AssertJ Core versions 1.4.0 through 3.27.6. The org.assertj.core.util.xml.XmlStringPrettyFormatter.toXmlDocument(String) method creates a DocumentBuilderFactory with insecure default XML-parser settings that permit DTD processing and external-entity resolution. The vulnerable formatter is reached by the isXmlEqualTo(CharSequence) assertion in AbstractCharSequenceAssert and may also be invoked directly through xmlPrettyFormat(String).
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No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
20 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A vulnerability tracked as CVE-2026-24400 affecting AlmaLinux 9 packages, addressed through AlmaLinux security advisory ALSA-2026:60215. The supplied record maps it to CWE-611 and assigns high confidentiality and availability impact in its CVSS v3 vector.
A vulnerability tracked as CVE-2026-24400 affecting the assertj-core package distributed for Rocky Linux 9.
A vulnerability affecting the assertj-core-javadoc package on Rocky Linux 10. The supplied record rates it high severity under CVSS v3 (7.5) and identifies confidentiality and availability impact, but does not describe the underlying technical flaw.
An XML External Entity (XXE) vulnerability in AssertJ/assertj-core that can cause information disclosure and denial of service. The referenced Red Hat advisory affects installed assertj-core packages on Red Hat Enterprise Linux 9.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.