Bug 2433116 (CVE-2026-24400)

Summary: CVE-2026-24400 assertj: AssertJ: Information disclosure and denial of service via XML External Entity (XXE)
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: abrianik, adamevin, aschwart, asoldano, ataylor, bbaranow, bmaxwell, boliveir, brian.stansberry, ccranfor, chfoley, darran.lofthouse, dbruscin, dhanak, dosoudil, drosa, dsimansk, eric.wittmann, fmariani, fmongiar, ggrzybek, gmalinko, ibek, istudens, ivassile, iweiss, janstey, jkoehler, jmartisk, jnethert, jpechane, jrokos, jscholz, kaycoth, kingland, kvanderr, kverlaen, lphiri, matzew, mnovotny, mosmerov, mposolda, msvehla, nipatil, nwallace, pantinor, parichar, pberan, pbizzarr, pdelbell, pesilva, pjindal, pmackay, rkubis, rmartinc, rstancel, rstepani, sausingh, sbiarozk, sdawley, smaestri, ssilvert, sthorger, swoodman, tasato, tcunning, tom.jenkinson, vmuzikar, yfang
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in AssertJ. An XML External Entity (XXE) vulnerability exists in the `XmlStringPrettyFormatter` component, which is used by the `isXmlEqualTo(CharSequence)` assertion. If an application processes untrusted XML input using these methods, a remote attacker could exploit this flaw to read arbitrary local files, perform Server-Side Request Forgery (SSRF) by making the server request arbitrary URLs, or cause a Denial of Service (DoS) through entity expansion attacks.
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Description OSIDB Bzimport 2026-01-26 23:01:53 UTC 
AssertJ provides Fluent testing assertions for Java and the Java Virtual Machine (JVM). Starting in version 1.4.0 and prior to version 3.27.7, an XML External Entity (XXE) vulnerability exists in `org.assertj.core.util.xml.XmlStringPrettyFormatter`: the `toXmlDocument(String)` method initializes `DocumentBuilderFactory` with default settings, without disabling DTDs or external entities. This formatter is used by the `isXmlEqualTo(CharSequence)` assertion for `CharSequence` values. An application is vulnerable only when it uses untrusted XML input with either `isXmlEqualTo(CharSequence)` from `org.assertj.core.api.AbstractCharSequenceAssert` or `xmlPrettyFormat(String)` from `org.assertj.core.util.xml.XmlStringPrettyFormatter`. If untrusted XML input is processed by tone of these methods, an attacker couldnread arbitrary local files via `file://` URIs (e.g., `/etc/passwd`, application configuration files); perform Server-Side Request Forgery (SSRF) via HTTP/HTTPS URIs, and/or cause Denial of Service via "Billion Laughs" entity expansion attacks. `isXmlEqualTo(CharSequence)` has been deprecated in favor of XMLUnit in version 3.18.0 and will be removed in version 4.0. Users of affected versions should, in order of preference: replace `isXmlEqualTo(CharSequence)` with XMLUnit, upgrade to version 3.27.7, or avoid using `isXmlEqualTo(CharSequence)` or `XmlStringPrettyFormatter` with untrusted input. `XmlStringPrettyFormatter` has historically been considered a utility for `isXmlEqualTo(CharSequence)` rather than a feature for AssertJ users, so it is deprecated in version 3.27.7 and removed in version 4.0, with no replacement.