CVE-2026-104712 is a vulnerability in Apache Struts
Published on October 5, 2026
Apache Struts: Disproportionate response size when rendering BigDecimal request parameters
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.
Vulnerability Analysis
CVE-2026-104712 is exploitable with network access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity, and a high impact on availability.
Weakness Type
What is an Amplification Vulnerability?
Software that does not appropriately monitor or control resource consumption can lead to adverse system performance. This situation is amplified if the software allows malicious users or attackers to consume more resources than their access level permits. Exploiting such a weakness can lead to asymmetric resource consumption, aiding in amplification attacks against the system or the network.
CVE-2026-104712 has been classified to as an Amplification vulnerability or weakness.
Products Associated with CVE-2026-104712
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Affected Versions
Apache Software Foundation Apache Struts:- Version 2.5.14, <= 2.5.33 is affected.
- Version 6.0.0, <= 6.11.0 is affected.
- Version 7.0.0, <= 7.3.0 is affected.