CVE-2026-24400

CRITICALNVD 9.19.1—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.1 under NVD CVSS v3. EPSS exploit probability: 0.0%, top 91% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
9.1
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 1%CVSS: 9.1Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
9.1
EG Score
9.1(medium)
EPSS
42.2%
KEV
Not listed

Published

January 26, 2026

Last Modified

March 9, 2026

Advisory Details (4)

Auto-updated Jun 8, 2026
Patch available. Sources: github_commit, github_release, github.
github Patch Available

XML External Entity (XXE) vulnerability when parsing untrusted XML via `isXmlEqualTo` assertion · Advisory · assertj/assertj · GitHub

https://github.com/assertj/assertj/security/advisories/GHSA-rqfh-9r24-8c9r
github_release Patch Available

v3.27.7

Patch available: assertj/assertj assertj-build-3.27.7

https://github.com/assertj/assertj/releases/tag/assertj-build-3.27.7
github_commit Patch Available

commit 85ca7eb6609b (assertj/assertj)

Patch available: assertj/assertj assertj-build-3.27.7 (contains commit 85ca7eb6609b)

https://github.com/assertj/assertj/commit/85ca7eb6609bb179c043b85ae7d290523b1ba79a
generic

XML External Entity Prevention - OWASP Cheat Sheet Series

https://cheatsheetseries.owasp.org/cheatsheets/XML_External_Entity_Prevention_Cheat_Sheet.html

Vendor Advisories for CVE-2026-24400(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(1 across 1 ecosystem)
Maven(1)
PackageVulnerable rangeFixed inDependents
org.assertj:assertj-core1.4.0 ... 3.9.1 (76 versions)3.27.7—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 12× in last 7d / 51× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-22 14:08 UTCEPSS rescore
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  1. 2026-07-08 15:15 UTCEPSS rescore
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  20. 2026-06-25 16:46 UTCOSV refresh
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  72. 2026-05-29 15:14 UTCEG score recompute
  73. 2026-05-29 13:44 UTCEPSS rescore
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Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-24400?
CVE-2026-24400 is a critical vulnerability published on January 26, 2026. 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…
When was CVE-2026-24400 disclosed?
CVE-2026-24400 was first published in the National Vulnerability Database on January 26, 2026, with the most recent update on March 9, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-24400 actively exploited?
CVE-2026-24400 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 42.2% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-24400?
CVE-2026-24400 has a CVSS v3 base score of 9.1 (NVD).
How do I remediate CVE-2026-24400?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-24400, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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