High · published October 5, 2026
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.
| Product | Versions | Fixed in |
|---|---|---|
| apache/struts | ≥ 2.5.14, ≤ 2.5.33 | — |
| apache/struts | ≥ 6.0.0, < 6.12.0 | 6.12.0 |
| apache/struts | ≥ 7.0.0, < 7.4.0 | 7.4.0 |