Files
struts/core
Lukasz Lenart 620fcbd152 WW-5621 Harden XML parsers against Entity Expansion (Billion Laughs) attacks (#1642)
Modern JDKs (7u45+) already protect against this attack with a built-in
64K entity expansion limit. These changes add defense-in-depth hardening
and remove unnecessary attack surface.

- Remove unused parseStringAsXML feature from StringAdapter to eliminate
  a theoretical XML Entity Expansion vector
- Deprecate setParseStringAsXML() and getParseStringAsXML() for removal
- Enable SECURE_PROCESSING feature in DigesterDefinitionsReader
- Add unit test verifying JDK's entity expansion limit rejects
  Billion Laughs payloads
- Add research document with vulnerability analysis

Co-authored-by: Claude <noreply@anthropic.com>
2026-04-04 11:20:33 +02:00
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Struts 2 Core

This is a core of the Apache Struts framework and all other modules depend on it. It requires Java 8 at minimum and a Servlet container supporting Java Servlet API 3.1 at least.

Installation

Just drop this plugin into WEB-INF/lib folder or add it as Maven dependency