{"id":"UBUNTU-CVE-2026-24400","details":"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.","modified":"2026-05-20T16:24:45.026397976Z","published":"2026-01-26T23:16:00Z","upstream":["CVE-2026-24400"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-24400"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-24400"},{"type":"REPORT","url":"https://cheatsheetseries.owasp.org/cheatsheets/XML_External_Entity_Prevention_Cheat_Sheet.html"},{"type":"REPORT","url":"https://github.com/assertj/assertj/commit/85ca7eb6609bb179c043b85ae7d290523b1ba79a"},{"type":"REPORT","url":"https://github.com/assertj/assertj/releases/tag/assertj-build-3.27.7"},{"type":"REPORT","url":"https://github.com/assertj/assertj/security/advisories/GHSA-rqfh-9r24-8c9r"}],"affected":[{"package":{"name":"assertj-core","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/assertj-core?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.3.0-1"],"ecosystem_specific":{"binaries":[{"binary_name":"libassertj-core-java","binary_version":"2.3.0-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-24400.json"}},{"package":{"name":"assertj-core","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/assertj-core?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.3.0-4"],"ecosystem_specific":{"binaries":[{"binary_version":"2.3.0-4","binary_name":"libassertj-core-java"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-24400.json"}},{"package":{"name":"assertj-core","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/assertj-core?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.3.0-4"],"ecosystem_specific":{"binaries":[{"binary_name":"libassertj-core-java","binary_version":"2.3.0-4"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-24400.json"}},{"package":{"name":"assertj-core","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/assertj-core?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.3.0-4"],"ecosystem_specific":{"binaries":[{"binary_version":"2.3.0-4","binary_name":"libassertj-core-java"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-24400.json"}},{"package":{"name":"assertj-core","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/assertj-core?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.14.0-2"],"ecosystem_specific":{"binaries":[{"binary_name":"libassertj-core-java","binary_version":"3.14.0-2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-24400.json"}},{"package":{"name":"assertj-core","ecosystem":"Ubuntu:25.10","purl":"pkg:deb/ubuntu/assertj-core?arch=source&distro=questing"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.26.3-2"],"ecosystem_specific":{"binaries":[{"binary_name":"libassertj-core-java","binary_version":"3.26.3-2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-24400.json"}},{"package":{"name":"assertj-core","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/assertj-core?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.26.3-2","3.26.3-2build1"],"ecosystem_specific":{"binaries":[{"binary_name":"libassertj-core-java","binary_version":"3.26.3-2build1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-24400.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V4","score":"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"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H"},{"type":"Ubuntu","score":"medium"}]}