CVE-2026-104712: Apache Struts

High severity, CVSS 7.5. EPSS: 0.9% chance of exploitation in the next 30 days.

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.

Affected products

• Apache Struts: from 2.5.14, up to and including 2.5.33; from 6.0.0, before 6.12.0 (fixed in 6.12.0); from 7.0.0, before 7.4.0 (fixed in 7.4.0)

Published 2026-10-05. Last modified 2026-10-08.