Severity: moderate Affected versions:
- Apache Struts 2.5.14 through 2.5.33 - Apache Struts 6.0.0 through 6.11.0 - Apache Struts 7.0.0 through 7.3.0 Description: Asymmetric resource consumption (amplification) vulnerability in Apache Struts. When a request parameter is bound to an arbitrary-precision decimal (java.math.BigDecimal) property that is then rendered through the Struts tag library, the framework can produce a response many orders of magnitude larger than the request, allowing an unauthenticated remote attacker to exhaust server CPU and outbound network capacity with sustained low-volume traffic. Applications that do not bind request parameters to BigDecimal properties, or never render such a property through the Struts tag library, are not affected. This issue affects Apache Struts: from 2.5.14 through 2.5.33, from 6.0.0 through 6.11.0, from 7.0.0 through 7.3.0. Users are recommended to upgrade to version 6.12.0 or 7.4.0, which fixes the issue. Credit: 0xCc.zhang (finder) References: https://cwiki.apache.org/confluence/display/WW/S2-076 https://struts.apache.org/ https://www.cve.org/CVERecord?id=CVE-2026-104712
