FKIE_CVE-2026-24400
Vulnerability from fkie_nvd - Published: 2026-01-26 23:16 - Updated: 2026-03-09 14:15
Severity ?
Summary
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.
References
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"value": "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."
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"lang": "es",
"value": "AssertJ proporciona aserciones de prueba fluidas para Java y la M\u00e1quina Virtual de Java (JVM). A partir de la versi\u00f3n 1.4.0 y antes de la versi\u00f3n 3.27.7, existe una vulnerabilidad de Entidad Externa XML (XXE) en `org.assertj.core.util.xml.XmlStringPrettyFormatter`: el m\u00e9todo `toXmlDocument(String)` inicializa `DocumentBuilderFactory` con configuraciones predeterminadas, sin deshabilitar DTDs o entidades externas. Este formateador es utilizado por la aserci\u00f3n `isXmlEqualTo(CharSequence)` para valores `CharSequence`. Una aplicaci\u00f3n es vulnerable solo cuando utiliza entrada XML no confiable con `isXmlEqualTo(CharSequence)` de `org.assertj.core.api.AbstractCharSequenceAssert` o `xmlPrettyFormat(String)` de `org.assertj.core.util.xml.XmlStringPrettyFormatter`. Si la entrada XML no confiable es procesada por uno de estos m\u00e9todos, un atacante podr\u00eda leer archivos locales arbitrarios a trav\u00e9s de URIs `file://` (por ejemplo, `/etc /passwd`, archivos de configuraci\u00f3n de la aplicaci\u00f3n); realizar Falsificaci\u00f3n de Petici\u00f3n del Lado del Servidor (SSRF) a trav\u00e9s de URIs HTTP/HTTPS, y/o causar Denegaci\u00f3n de Servicio a trav\u00e9s de ataques de expansi\u00f3n de entidad \"Billion Laughs\". `isXmlEqualTo(CharSequence)` ha sido desaprobado a favor de XMLUnit en la versi\u00f3n 3.18.0 y ser\u00e1 eliminado en la versi\u00f3n 4.0. Los usuarios de las versiones afectadas deber\u00edan, en orden de preferencia: reemplazar `isXmlEqualTo(CharSequence)` con XMLUnit, actualizar a la versi\u00f3n 3.27.7, o evitar usar `isXmlEqualTo(CharSequence)` o `XmlStringPrettyFormatter` con entrada no confiable. `XmlStringPrettyFormatter` hist\u00f3ricamente ha sido considerado una utilidad para `isXmlEqualTo(CharSequence)` en lugar de una caracter\u00edstica para los usuarios de AssertJ, por lo que es desaprobado en la versi\u00f3n 3.27.7 y eliminado en la versi\u00f3n 4.0, sin reemplazo."
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"id": "CVE-2026-24400",
"lastModified": "2026-03-09T14:15:14.980",
"metrics": {
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"confidentialityImpact": "HIGH",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
"version": "3.1"
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"source": "nvd@nist.gov",
"type": "Primary"
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"Recovery": "NOT_DEFINED",
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"attackVector": "LOCAL",
"availabilityRequirement": "NOT_DEFINED",
"baseScore": 8.2,
"baseSeverity": "HIGH",
"confidentialityRequirement": "NOT_DEFINED",
"exploitMaturity": "NOT_DEFINED",
"integrityRequirement": "NOT_DEFINED",
"modifiedAttackComplexity": "NOT_DEFINED",
"modifiedAttackRequirements": "NOT_DEFINED",
"modifiedAttackVector": "NOT_DEFINED",
"modifiedPrivilegesRequired": "NOT_DEFINED",
"modifiedSubAvailabilityImpact": "NOT_DEFINED",
"modifiedSubConfidentialityImpact": "NOT_DEFINED",
"modifiedSubIntegrityImpact": "NOT_DEFINED",
"modifiedUserInteraction": "NOT_DEFINED",
"modifiedVulnAvailabilityImpact": "NOT_DEFINED",
"modifiedVulnConfidentialityImpact": "NOT_DEFINED",
"modifiedVulnIntegrityImpact": "NOT_DEFINED",
"privilegesRequired": "LOW",
"providerUrgency": "NOT_DEFINED",
"subAvailabilityImpact": "NONE",
"subConfidentialityImpact": "HIGH",
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"userInteraction": "NONE",
"valueDensity": "NOT_DEFINED",
"vectorString": "CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:L/SC:H/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
"version": "4.0",
"vulnAvailabilityImpact": "LOW",
"vulnConfidentialityImpact": "HIGH",
"vulnIntegrityImpact": "NONE",
"vulnerabilityResponseEffort": "NOT_DEFINED"
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"source": "security-advisories@github.com",
"type": "Secondary"
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"published": "2026-01-26T23:16:08.803",
"references": [
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"tags": [
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"url": "https://cheatsheetseries.owasp.org/cheatsheets/XML_External_Entity_Prevention_Cheat_Sheet.html"
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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