CVE-2026-104712
Received Received - Intake

Asymmetric Resource Consumption in Apache Struts via BigDecimal

Publication date: 2026-10-05

Last updated on: 2026-10-05

Assigner: Apache Software Foundation

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.

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Meta Information

Published
2026-10-05
Last Modified
2026-10-05
Generated
2026-10-05
AI Q&A
2026-10-05
EPSS Evaluated
N/A
NVD
CVE-2026-104712
EUVD
EUVD-2026-92623

Affected Vendors & Products

Showing 3 associated CPEs
Vendor Product Version / Range
Apache Software Foundation Apache Struts 2.5.14
Apache Software Foundation Apache Struts 6.0.0
Apache Software Foundation Apache Struts 7.0.0

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-405 The product does not properly control situations in which an adversary can cause the product to consume or produce excessive resources without requiring the adversary to invest equivalent work or otherwise prove authorization, i.e., the adversary's influence is "asymmetric."

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Executive Summary

This is an asymmetric resource consumption vulnerability in Apache Struts. When a request parameter is bound to a java.math.BigDecimal property and rendered through the Struts tag library, the response becomes much larger than the original request. This can exhaust server CPU and network capacity with low-volume traffic without requiring authentication.

Detection Guidance

Monitor for unusually large HTTP responses from Struts applications, especially when request parameters are bound to BigDecimal properties. Check server CPU and network usage spikes during low-volume traffic. Inspect Struts logs for requests involving decimal parameters rendered through tag libraries.

Impact Analysis

An unauthenticated remote attacker could exploit this to cause a Denial of Service by overwhelming server resources and network bandwidth with minimal traffic. This may lead to degraded performance or complete service unavailability for affected applications.

Mitigation Strategies

Upgrade Apache Struts to version 6.12.0 or 7.4.0. As a temporary workaround, register an application-supplied type converter for BigDecimal in struts-conversion.properties or xwork-conversion.properties to limit value scale before rendering.

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